Scientific Research

Dr. Subhash’s research aims to unveil the relevant correlations that control the physics in the strongly correlated regime and to develop few new spinel cubic phase nanostructures useful for microwave devices. Understanding the physics of strongly correlated electron systems is one of the most fascinating and difficult problems in condensed matter physics. In a recent work, he addressed the origin of re-entrant spin-glass behavior and complex magnetic properties of the few ferrimagnetic spinels like Mn3O4 and Co2SnO4.

Dr. Subhash’s research also focuses on the synthesis and characterization of Nanostructured Magnetic Materials, Re-entrant spin-glass behavior, High-k dielectrics and Relaxor-ferroelectrics. In some recent reports, he demonstrated the origin of relaxor like behavior in Dy2O3 doped KNaNbO3 ceramics and Zn1-xNixO/NiO two-phase composites.

Research Interests:

Spintronic Materials - Interlayer coupling in multilayers, Magneto-transport properties, Multiferroics, and Half metals

Magnetocaloric Effect - Magnetic Cooling in thin-film Superlattices/Heterostructures and Mixed valence compounds

Nanostructures - Controlled synthesis and charecterization of nanometer size magnetic and magnetic-semiconductors

Band-gap Engineering - III-V, II-V, IV-VI groups based binary, ternary and quaternary coumpound semiconductors

Ferroelectrics and High-k Dielectrics - KNN based Relaxor-Ferroelectric oxides and ZrO2 based high k-dielectrics

Completed & On-going Research Projects:

(1) Department of Atomic Energy (DAE-BRNS) Project grant INR: 20 Lakhs-YSRA scheme 2015-17 (Completed).

Topic: "Dielectric studies of few disordered complex spinels" .

(2) Department of Science and Technology DST-SERB Young Scientist Grant of INR: 24 Lakhs 2015-2017 (Completed).

Topic: "Investigation of the Relaxor-like ferroelectric behavior of few two-phase oxide composite systems" .

(3) Board of Research in Fusion Science & Technology, National Fusion Programme. Grant: 34 Lakhs 2011-2016 extended.

Topic: "Dielectric and thermal characterization of Mg(Zr0.05Ti0.95)O3 ceramics for microwave window applications".

Research Students:

Post-Doctoral Fellows: Dr. Priyanka Tiwari (NPDF, 2022) and Dr. Tanveer Ahmed Dar (IPDF)

Ph.D. Students :

• Dr. P. Pramanik (Completed, 28th May 2020, Currently at Uppsala University Sweden)

• Dr. Deep Chandra Joshi (2018 Completed, Currently at Uppsala University Sweden)

• Dr. Sayandeep Ghosh (Completed, 2022, Chungbuk national university, South Korea)

• Dr. Sanjib Nayak (2018 Completed, Currently at Hong Kong City University, NPDF-IIT M)

• Dr. Robin T George (May 2019 Completed)

Ms. Mouli Roy Chowdhury (on-going), Maruthi R (on-going), Ms. Shaona Das (on-going), Mr. Ravi Kiran Dokala (on-going), Mr. Suchit Kumar Jena (on-going) and Arpita Deb Singha (On going), Harshita Singh (On going), Arijit Datta (On going)

M.Sc Students : Mr. Sobhi Kumar Singh (2012-2013, Currently at WVU-Morgantown, USA), Ayan Mallick (2012-2013, Currently at Burdwan University, WB, India), Ms. Jyotsna Dhillon (2014-2016, Currently at University of North Texas, Denton, USA), Mr. Rakesh Sarkar (2014-2016, Currently at IIT Guwahati), Anshul Thakur (2016-18), Ameer Mehr (2016-18), Priti Kumari (2012-14), Mahender Sehrawat (2017-2019) , Bhupesh Yadav (2017-2019), Shalini Kushwah (2018-20) and Arjyama Bordoloi (2022)

B.Tech Students: Mr. G. Naga Mahesh (20118-19), Mr. Akshit Keelu (2018-19), Mr. Souvick Biswas (2017-18)-Engineering Physics, Mr. Rohan Soni (2016-17)-Engineering Physics, Mr. Tere Nagendra Babu (2017) -Engineering Physics, Mr. Dayapule Durga Harish (Currently at REConnect Energy, Bangalore-India), D. Roy -Electrical Engineering (Purdue University, West Lafayette, IN, United States), B. B. Singh (2014-2016)

Publications in International Journals:

For recent updates see this link: https://orcid.org/0000-0003-0740-2195 https://scholar.google.co.in/citations?user=vOjBt04AAAAJ&hl=en

Unraveling the nature of ferrimagnetism and associated exchange interactions in distorted honeycomb Ni4Nb2O9

S. Thota, M. S. Seehra, M. R. Chowdhury, H. Singh, S. Ghosh, S. K. Jena, P. Pramanik, T. Sarkar, R. S. Rawat, R. Medwal, and B. Weise

Phys. Rev. B 106, 134418,(2022)

Strong correlation between structure and magnetic ordering in tetragonally distorted off-stoichiometric spinels

P. Pramanik, M. Reehuis, M. Tovar, A. Hoser, J.-U. Hoffmann, Y. S. Chen, J. G. Lin, B. Weise, A. Waske, and S. Thota

Phys. Rev. Materials 6, 034407 (2022)

Substrate orientation dependent characteristics of half-metallic and metallic superlattices [La0.7Sr0.3MnO3/LaNiO3]10

Shaona Das, Ranganadha Gopalarao Tanguturi, Sayandeep Ghosh, Ravi Kiran Dokala, Rohit Medwal, Surbhi Gupta, Zhuo Yan, Yan Qi, Rajdeep Singh Rawat, Subhash Thota

Journal of Applied Physics 131, 125305 (2022)

Magnetic ground state and exchange interactions in the Ising chain ferromagnet CoNb2O6

S. Thota, S. Ghosh, Maruthi R, D. C. Joshi, R. Medwal, R. S. Rawat and M. S. Seehra

Physical Review B: 103, 064415 (2021)

Tailoring the Electronic Structure and Magnetic Properties of Pyrochlore Co2Ti1-xGexO4: A GGA+U ab initio Study

Sayandeep Ghosh, Sobhit Singh, Debashish Das, Subhradip Ghosh, Pankaj Kumar Mishra and Subhash Thota

Journal of Physics: Condensed Matter 33 (14), 145504 (2021)IOP

Magnetic ground state, field-induced transitions, electronic structure, and optical band gap of the frustrated antiferromagnet GeCo2O4

P. Pramanik, S. Ghosh, P. Yanda, D. C. Joshi, S. Pittala, A. Sundaresan, P. K. Mishra, S. Thota, and M. S. Seehra

Physical Review B: 99, 134422 (2019)

Neutron diffraction evidence for local spin canting, weak Jahn-Tellet distortion, and magnetic compensation in Ti1-xMnxCo2O4

P. Pramanik, D. C. Joshi, M Reehuis. A. Hoser, J-U Hoffmann, R. S. Manna, T Sarkar and S. Thota

J. Phys.: Condens. Matter 32, 245801 (2020)

Low-temperature anomalous spin correlations and Kondo effect in ferromagnetic SrRuO3/LaNiO3/La0.7Sr0.3MnO3 trilayers

Sayandeep Ghosh, R. G. Tanguturi, P. Pramanik, D. C. Joshi, P. K. Mishra, S. Das, and S. Thota

Physical Review B: 99, 115135 (2019)

Cationic distribution, exchange interactions, and relaxation dynamics in Zn-diluted MnCo2O4 nanostructures

P. Pramanik, D. C. Joshi, N. Tiwari, T. Sarkar, S. Pittala, O.O. Salman, M.-M. Manga, and S. Thota

Journal of Applied Physics 125, 124302 (2019)

Effects of radiative local heating on metal solidification during selective laser melting for additive manufacturing

Beom Seok Kim, Namkyu Lee, Subhash Thota, Thomas Gemming, and Hyung Hee Cho

Applied Surface Science 496, 143594,(2019)

Thermal hysteresis and vibrational excitations in NiO containing NaNbO3

R. T. George, T. A. Dar, D. C. Joshi, V. Sathe, A. K. Rathore and S. Thota

Journal of Physics D: Applied Physics 52, 115301 (2019)

Role of dilution on the electronic structure and magnetic ordering of spinel cobaltites

Sayandeep Ghosh, Sobhit Singh, Deep Chandra Joshi, Prativa Pramanik, Subhradip Ghosh, Pankaj Kumar Mishra, and Subhash Thota

Physical Review B, 98, 235119(2018) APS

Structural and magnetic properties of LaSrMnO3/LaCoO3 heterostructures

S. Thota, K. Roychowdhury, V. Thakare, S. C. Ganguli, Z. H. Chen, E. J. Guo and S. Das

Applied Physics Letters 113, 122405 (2018)

Interfacial magnetism in LaSrMnO3/LaNiO3 ultrathin superlattices

Sujit Das, Sayandeep Ghosh, Prativa Pramanik, Deep Chandra Joshi, and Subhash Thota

Journal of Physics D: Applied Physics 51, 325001 (2018) IOP

Nature of magnetic ordering in nanocomposites of Zn1-pNipO and NiO

D. C. Joshi, P. Pramanik, R. T. George, T. Sarkar, and S. Thota

Physica E: Low-dimensional Systems and Nanostructures 103, 46 (2018) Elsevier

Cubic phase stability, optical and magnetic properties of Cu-stabilized zirconia nanocrystals

P. Pramanik, S. Singh, D. C. Joshi, A. Mallick, K. Pisane, A. H. Romero, S. Thota and M. S. Seehra

Journal of Physics D: Applied Physics 51, 225304 (2018)

Effect of NiO substitution on the structural and dielectric behaviour of NaNbO3

R.T George, D.C Joshi, S. Nayak, N. Tiwari, R.N Chauhan, P. Pramanik, T. A Dar, S. Ghosh, S. Thota

Journal of Applied Physics 123, 054101 (2018)

Magnetic compensation, field-dependent magnetization reversal, and complex magnetic ordering in Co2TiO4

S Thota, M Reehuis, A Maljuk, A Hoser, JU Hoffmann, B Weise, A Waske, M. Krautz, D. C. Joshi, S. Nayak, S. Ghosh, P. Suresh, K. Dasari, S. Wurmehl, O. Prokhnenko, and B. Büchner

Physical Review B 96(14), 144104 (2017)

Modulation of Peptide Based Nano-Assemblies with Electric and Magnetic Fields

G. Pandey, J. Saikia, S. Sasidharan, D. C. Joshi, S. Thota, H. B. Nemade, N. Chaudhary & V. Ramakrishnan

Nature Scientific Reports 7, 2726 (2017)

Magnetic phase diagram of Co(Cr1-xAlx)2O4

R. Padam, T. Sarkar, R. Mathieu, S. Thota and D. Pal

Journal of Applied Physics 122, 073908 (2017)

Dielectric Properties of (1-x)KNbO3–xNiO Two-Phase Composites

R. Soni, R George, D C Joshi, S Nayak, P Pramanik, P Suresh, T A Dar and S Thota

Journal of Physics D: Applied Physics 50, 415305 (2017)

Structural and Dielectric Properties of the Fluorite-Type LaxCe1− xO2-δ Ceramics

D. C. Joshi, P. Pramanik, S. Nayak, K. Dasari, R. J. Choudhary, S. Thota

Journal of Physics D. Applied Physics, 50, 495601(2017) IOP

Magnetic exchange interactions and dielectric studies of Zn1–xNixO–NiO composites

D. C. Joshi, P. Pramanik, S. Nayak, K. Dasari, R. J. Choudhary, S. Thota

Journal of Physics D: Applied Physics 50, 325002 (2017)

Finite-size-scaling and Exchange-Bias in SrRuO3/LaNiO3/SrRuO3 Trilayers

S. Thota, S. Ghosh, S. Nayak, D. C. Joshi, P. Pramanik, K. Roychowdhury, and S. Das

Journal of Applied Physics 120, 124304 (2017)

Effects of Cu doping on the electronic structure and magnetic properties of MnCo2O4 nanostructures

P. Pramanik, S. Thota, S. Singh, D. C Joshi, B. Weise, A. Waske, M. S Seehra

Journal of Physics: Condensed Matter 29 (42), 425803 (2017)

Size-dependent structural, magnetic, and optical properties of MnCo2O4 nanocrystallites

S. Singh, P. Pramanik, S. Sangaraju, A. Mallick, L. Giebeler, S. Thota

Journal of Applied Physics 121 (19), 194304 (2017)

Low-temperature anomalous magnetic behavior of Co2TiO4 and Co2SnO4

S. Nayak, K. Dasari, D. C. Joshi, P. Pramanik, R. Palai, A. Waske, R. N. Chauhan, N. Tiwari, T. Sarkar and S. Thota

Journal of Applied Physics 120, 163905 (2016)

Spectroscopic studies of Co2TiO4 and Co3O4 two-phase composites

S. Nayak, K. Dasari, D. C. Joshi, P. Pramanik, R. Palai, V. Sathe, R. N. Chauhan, N. Tiwari and S. Thota

Physica Status Solidi B 253 (11), 2270 (2016) Wiley

Peculiarities of the temperature dependence of electron spin resonance and Raman studies of Zn1-xNixO/NiO two-phase nanocomposites

D. C. Joshi, S. Nayak, A. Kumar, A. Mohanta, D. Pamu and S. Thota

Journal of Applied Physics, 119, 074303 (2016) AIP

Reentrant spin-glass behavior and bipolar exchange-bias effect in “Sn” substituted cobalt-orthotitanate

S. Nayak, D. C. Joshi, M. Krautz, A. Waske, J. Eckert and S. Thota

Journal of Applied Physics, 119, 043901 (2016) AIP

Magnetic compensation, field-dependent magnetization reversal, and complex magnetic ordering in Co2TiO4

S. Nayak, S. Thota, D. C. Joshi, M. Krautz, A. Waske, A. Behler, J. Eckert, T. Sarkar, M. S. Andersson, R. Mathieu, V. Narang, and M. S. Seehra

Physical Review B, 92, 214434 (2015) APS

Dielectric Response and AC-conductivity Studies of Gd2O3-Contained K0.5Na0.5NbO3 Piezoelectric Ceramics

M. Peddigari, S. Thota and P. Dobbidi

IEEE Transactions on Dielectrics and Electrical Insulation, 22, 3668 (2015) IEEE

Localized charge carrier transport properties of Zn1−xNixO/NiO two-phase composites

D. C. Joshi, K. Dasari, S. Nayak, R. Palai, P. Suresh, S. Thota

Journal of Electronic Materials, 45, 2059 (2016) Springer

The X-ray photoelectron spectroscopy and high-temperature structural studies of Zn1-xNixO/NiO two-phase composites

D. C. Joshi, S. Nayak, P. Suresh, K. S. Suresh, B.V.M. Kumar, S. Thota

Physica Status Solidi (b) ,67, 523 (2015)

On the nature of magnetic state in the spinel Co2SnO4

S. Thota, V. Narang, S. Nayak, S. Sambasivam, B.C. Choi, T. Sarkar, M. S. Andersson, R. Mathieu, and M. S. Seehra

Journal of Physics.: Condensed Matter, 27, 166001 (2015) IOP

Addendum: Co-existence of ferrimagnetism and spin-glass state in the spinel Co2SnO4

S. Thota and M. S. Seehra

Journal of Appled Physics 118, 129901 (2015)

The ac-magnetic susceptibility and dielectric response of complex spin-ordering process in Mn3O4

S. Thota, K. Patyal, S. Nayak, Ch. Simon, J. Kumar and W. Prellier

Journal of Applied Physics 116, 103906 (2014)

The dielectric behavior of Zn1-xNixO/NiO two-phase composites

D. C. Joshi, S. Thota, S. Nayak. D. D. Harish, D. Pamu, Md. Qureshi

Journal of Physics D: Applied Physics 47, 435305 (2014)

Dielectric Response and AC-conductivity Studies of Gd2O3-Contained K0.5Na0.5NbO3 Piezoelectric Ceramics

M. Peddigari, S. Thota, D. Pamu

IEEE Transactions on Dielectrics and Electrical Insulation, 22, 3668 (2015)

Dielectric and ac-conductivity studies of Dy2O3 doped KNaNbO3 ceramics

M. Peddigari, S. Thota, D. Pamu

AIP Advances 4(8), 087113 (2014)

Ion induced secondary electron emission, Optical and hydration resistance behavior of MgO, Mg-Mo-O and Mg-Ce-O thin films

A. Kumar, S. Thota, D. Deva and J. Kumar

Thin Solid Films 556, 260 (2014)

Structural and Dielectric studies of Co doped MgTiO3 thin-films fabricated by RF magnetron sputtering

T. S. Kumar, P. Gogoi, S. Thota, D. Pamu

AIP Advances 4, 067142 (2014)

Size-dependent shifts of the Neel temperature and optical band-gap in NiO nanoparticles

S. Thota, J. H. Shim, and M. S. Seehra

Journal of Applied Physics, 114, 214307, (2013) Letters

Co-existence of ferrimagnetism and spin-glass state in the spinel Co2SnO4

S. Thota, and M. S. Seehra

Journal of Applied Physics, 113, 203905,(2013)

Memory Effects and Relaxation Dynamics of MnCo2O4 Nanocrystallites

S. Thota, S. K. Das, A. Kumar, S. Sangaraju and B. C. Choi

IEEE Transactions on Magnetics, 49, 1020, (2013)

Formation mechanism, Optical and Magneto-dielectric studies of new cubic spinel MgMnO3

S. Thota, K. Singh, B. Prasad, J. Kumar, Ch. Simon and W. Prellier

AIP Advances 02, 032140 (2012)

Synthesis, Structure and Magnetic behaviour of Nanoparticles of Cubic ZnMnO3

J. Rall, S. Thota, J. Kumar, and M. S. Seehra

Applied Physics Letters 100, 252407 (2012)

Synthesis and Optical Characterization of Mg1-xNixO Nanostructures

N. Budiredla, A. Kumar, S. Thota, and J. Kumar

Nanomaterials 10, 5402 (2012)

On the derivation of magnetocaloric properties in ferrimagnetic spinel-Mn3O4

S. Thota, F. Guillou, V. Hardy, A. Wahl, W. Prellier and J. Kumar

Journal of Applied Physics, 109, 053902, (2011)

Magnetic transitions in Mn3O4 and an anomaly at 38 K in magnetization and specific heat

F. Guillou, S. Thota, W. Preellier, J. Kumar and V. Hardy

Physics Review B, 83, 094423, (2011)

Magnetic frustration and short-range ordering in cubic defect spinel MgMnO3

M. S. Seehra, V. Singh and S. Thota

Journal of Applied Physics, 110, 113907, (2011) Letters

Anisotropic magnetocaloric efect in all-ferromagnetic (La0.7Sr0.3MnO3/SrRuO3) superlattices

S. Thota, Q. Zhang,F. Guillou, U. Luders, W. Preellier, A. Wahl and P. Padhan

Applied Physics Letters, 97, 112506 [1-3], (2010)

Synthesis and magnetic properties of nanocrystals of cubic defect spinel MgMnO3

M.S. Seehra, V. Singh, S. Thota, B. Prasad and J. Kumar

Applied Physics Letters, 97, 112507 [1-3], (2010)

Magnetocaloric effect and improved relative cooling power in (La0.7Sr0.3MnO3/SrRuO3) superlattices

Q. Zhang, S. Thota, ,F. Guillou, A. Wahl, P. Padhan, V. Hardy and W. Preellier

J. Phys: Conden. Matter, 23, 052201, (2010) Fast track Communication

Optical, electrical and magnetic properties of Co3O4 nanocrystallites obtained by thermal decomposition of sol–gel derived oxalates

S. Thota, A. Kumar, J. Kumar

Materials Science and Engineering: B, 164, 30-37 (2009)

Ferromagnetic ordering in PLD grown Zn1-xNixO/ZnO bilayer thin films

S. Thota, L.M. Kukreja and J. Kumar

Thin Solid Films, 517, 750-754(2008)

A comparative study of magnetic properties of bulk and nanocrystalline Co3O4

P.Dutta, M.S.Seehra, S.Thota and J.Kumar

Journal of Physics Condesed Matter, 20, 015218[1-8](2008)

Sol-gel synthesis and behaviour of Ni containing ZnO nano-particles

S.Thota and J.Kumar

Journal of Nanoscience and Nanotechnology, 8, 4073-80 (2008)

Preparation, microstructure and optical absorption of NiO thin films

A.K. Srivastava, S. Thota and J. Kumar

Journal of Nanoscience and Nanotechnology, 8, 4111-15 (2008)

Sol- gel synthesis and anomalous magnetic properties of NiO nano-particles

S. Thota and J. Kumar

Journal of Physics and Chemistry of Solids, 68, 1951-64 (2007)

On the sol-gel synthesis and thermal, structural, and magnetic studies of transition metal(Ni, Co, Mn) containing ZnO powders

S. Thota, T. Dutta and J. Kumar

Journal of Physics Condensed Matter, 18, 2473-86 (2006)

Formation and magnetic behaviour of manganese oxide nanoparticles

S. Thota, B. Prasad and J. Kumar

Materials Science and Engineering: B, 167, 153-160 (2010)

Sol-gel synthesis of highly luminesent magnesium oxide nanocrystals

A. Kumar, S. Thota, S. Varma and J. Kumar

Journal of Luminescence, 131, 640 (2010)

Sol-gel synthesis and optical behavior of Mg-Ce-O nanocrystals

A. Kumar, S. Thota, S. Sivakumar, S. Priya and J. Kumar

J. Sol Gel. Sci. Technol. 67, 1047 (2013)

Research work presented in International and National conferences

Antiferromagnetic Spin-glass Properties of few Spinels: The Role of Dilution and Geometrical Frustration

Subhash Thota

IIT and NIMS Materials Science Workshop December 6-9, 2021

Coexistence of Ferrimagnetic Ordering and Spin-glass state in Spinel Zn(Fe1-xRux)2O4: Role of Jahn-Teller Active Spin-1/2 Cu2+ ions at B-sites

Suchit Kumar Jena, Sayandeep Ghosh and Subhash Thota

Scientific Programme of National conference on Quantum Condensed Matter(QMAT - 2021)December 08 – 11, 2021

QMAT 2021

Phonon Dispersion in Anisotropic Dilute Alloys by Weighted Dynamical-Matrix Approach

Mina Aziziha, Saeed Akbarshahi, Sayandeep Ghosh, Prativa Pramanik, James Patrick Lewis, Aldo H Romero, Suresh Pittala, Subhash Thota, Mohindar S Seehra, and Matthew Bruce Johnson

APS March Meeting 2020, Volume 65, Number 1, Session P63: Defects: Structure and Strain 1, 2:30 PM–5:18 PM, Wednesday, March 4, 2020, Room: Mile High Ballroom 4D, Denver, Colorado, USA

APS March Meeting 2020

Electronic Structure of the Glassy Antiferromagnetic Spinel ZnTiCoO4: A DFT+U Approach

Mouli Roy Chowdhury, Sayandeep Ghosh, Sobhit Singh, Subhradip Ghosh, Mohindar S Seehra and Subhash Thota

Scientific Programme of National conference on Quantum Condensed Matter(QMAT - 2021)December 08 – 11, 2021

QMAT 2021

Structural and Magnetization Studies of Cu, Mn co-doped Franklinite

S. K. Jena, A. K. Hota, S. Ghosh, M. R. Chowdhury, Maruthi R, S. Thota

Conference on Condensed Matter Physics (CCMP) 2021, Physical Research Laboratory, 16-18th August, 2021

CCMP-2021

Crystal Structural and Micro Raman Studies of Mg1-xNixO Solid Solutions

S. K. Jena, S. Singh, S. Ghosh, A. Keelu, P. Pramanik and S. Thota

UGC-SAP (DRS II) Sponsored SECOND NATIONAL CONFERENCE ON HARD AND SOFT CONDENSED MATTER PHYSICS, (NCHSCMP-2019), March 4-6,2019, Tezpur, Assam, India

Negative magnetization and field induced transitions in Y1-xCexCrO3

R. K. Dokala, S. Das and S. Thota

Scientific Programme of National conference on Quantum Condensed Matter(QMAT - 2021)December 08 – 11, 2021

QMAT 2021

Magnetic properties of Y1-xCexCrO4 nanocrystals

R. K. Dokala, S. Das and S. Thota

MRSI-AGM Materails Conclave (MRSI-AGM), IIT Madras, 20-23 December, 2021

MRSI-AGM-2021

EPR and Magnetic properties of the antiferromagnet MnNb2O6

Maruthi R and S. Thota

Conference on Condensed Matter Physics (CCMP) 2021, Physical Research Laboratory, 16-18th August, 2021

CCMP-2021

Structural and Vibrational Excitations in Dy1-xCexCrO3 Solid solutions

S. Das, R. K. Dokala and S. Thota

MRSI-AGM Materails Conclave (MRSI-AGM), IIT Madras, 20-23 December, 2021

MRSI-AGM-2021

Altered Antiferromagnetic State and Exchange Bias of Bulk Co3O4 Granular Matrix Dispersed in Nonmagnetic CeO2

S. Singh, P. Pramanik, D. C. Joshi and S. Thota

Research Conclave-2019, 14-17 March 2019, IIT Guwahati, India

Electron Magnetic Resonance of Mangano-Columbite MnNb2O6

Maruthi R, R. Medwal, R. Singh and S. Thota

MRSI-AGM Materails Conclave (MRSI-AGM), IIT Madras, 20-23 December, 2021

MRSI-AGM-2021

Tunable Spin-reorientation Transitions in Canted Antiferromagnet Dy1-xCexCrO3

Shaona Das, Ravi Kiran Dokala and Subhash Thota

Scientific Programme of National conference on Quantum Condensed Matter(QMAT - 2021)December 08 – 11, 2021

QMAT 2021

Compositional dependence of Vibrational Excitations in Fe substituted MnCo2O4 Ferrimagnetic Spinels

S. Singh, P. Pramanik, S. K. Jena, B. Yadav, M. Sehrawat and S. Thota

UGC-SAP (DRS II) Sponsored SECOND NATIONAL CONFERENCE ON HARD AND SOFT CONDENSED MATTER PHYSICS, (NCHSCMP-2019), March 4-6,2019, Tezpur, Assam, India

Evidence for Field Induced Phase Transitions and Enhanced Long-range Ordering in Fe doped MnCo2O4

B. Yadav, S. Ghosh, M. Sehrawat, S. Singh, P. Pramanik, S.K. Jena, D.C. Joshi and S. Thota

Research Conclave-2019, 14-17 March 2019, IIT Guwahati, India

Magnetic Properties of Spin Ising Chain Manganocolumbite MnNb2O6

Ayush Vardhan Singh, Prativa Pramanik, Shalini Kushwaha, Sayandeep Ghosh, Maruthi Ramachandraiah, Subhash Thota

National Conference on Progresses in Material Science Research (PMSR-2020),February 4-6, 2020, Dibrugarh University, India

High Temperature Magnetization Studies of Mixed Spinel Cu1-xZnxFe2O4

S. K. Jena, S. Ghosh, S. Kushwaha, S. Sharma, D.C. Joshi and S. Thota

National Conference on Progresses in Material Science Research (PMSR-2020),February 4-6, 2020, Dibrugarh University, India

Pulsed Laser Growth of [Pr1-xCaxMnO3/SrTiO3]15 Superlattices

Ravi K. Dokala, Shaona Das, Sujt Das, Soumya R. Ratha, Maruthi R, Subhash Thota

National Conference on Progresses in Material Science Research (PMSR-2020),February 4-6, 2020, Dibrugarh University, India

Magnetic Exchange Bias and Spin-glass state in Cobaltorthoruthanate

S. Ghosh, A. V. Singh, S. Sharma, T. Sarkar, S. Thota

National Conference on Progresses in Material Science Research (PMSR-2020),February 4-6, 2020, Dibrugarh University, India

Structural, Morphological and Elemental Analysis of Manganocolumbite

Shalini Kushwaha, Suchit Kumar Jena, Ayush Vardhan Singh and Subhash Thota

National Conference on Progresses in Material Science Research (PMSR-2020),February 4-6, 2020, Dibrugarh University, India

Electronic Structure Studies of [La0.7Sr0.3MnO3/LaAlO3]15 Superlattices

Shaona Das, Ravi Kiran Dokala, Sujt Das, Sayandeep Ghosh, Subhash Thota

National Conference on Progresses in Material Science Research (PMSR-2020),February 4-6, 2020, Dibrugarh University, India

Complex Magnetic Ordering in Ultrathin Oxide Superlattices and Nanostructures

S. Thota (Invited Talk)

International Conference on Nano-Structured Materials and Devices (ICNSMD-2018), University of Delhi, India

Crystal structure and Magnetic Properties of Germanium doped MnCo2O42

M. Sehrawat, B.Yadav, S.Ghosh, S.Singh,P.Pramanik,S.K.Jena, D.C.Joshi and S. Thota

Research Conclave-2019, 14-17 March 2019, IIT Guwahati, India

Finite-Size Effects and Semi-Spin-Glass Behavior of Few Complex Spinels

S. Thota (Invited Talk)

International Conference on Materials for Energy Applications (ICME-18) December 06-08, 2018. S.S. Jain Subodh P.G. College Jaipur,India

Vibrational Raman Excitations and Broadband Dielectric Spectroscopy of Mg doped NiO

S. Mohapatra, S. K. Jena, A. Keelu, S. Singh, P. Pramanik, D.C. Joshi and S. Thota

Research Conclave-2019, 14-17 March 2019, IIT Guwahati, India

Density Functional Theory Studies of Co-based Spinels

S. Ghosh, S. Singh, P.K. Mishra, S. Thota

International Conference on Systems and Processes in Physics, Chemistry and Biology (ICSPPCB- 2018), 1-3 March, 2018, Silchar, Assam, India

Finite-Size effects in the Optical and Magnetic Properties of MnCo2O4 Nanostructures

S. Singh, P.Pramanik, M. S. Seehra, and S. Thota

American Physical Society (APS) March 13–17, 2017, New Orleans, Louisiana (USA), Bulletin of the American Physical Society

Structural and ac-electrical transport of Anti-ferroelectric NaNbO3 and NiO composites

R.T. George, T.A. Dar, D.C. Joshi, S. Nayak, S. Thota

International Conference on Systems and Processes in Physics, Chemistry and Biology (ICSPPCB- 2018), 1-3 March, 2018, Silchar, Assam, India

Morphotropic Phase Boundary Engineering and Dielectric Excitations in NaNbO3-MgMnO3 Composites

A. Meher, A. Thakur, D.C. Joshi, P.Pramanik and S. Thota

Research Conclave-2018, 8-11 March 2018, IIT Guwahati, India

Synthesis, Structural and Magnetic Properties of Ni1-xMgxO Nanostructures

S. K. Jena, S. Mohapatra, S. Singh, P. Pramanik, D.C. Joshi and S. Thota

Research Conclave-2018, 14-17 March 2019, IIT Guwahati, India

High Temperature Dielectric Behavior of Spin-1/2 Frustrated Kagome Magnet Co3V2O8

A. Thakur, P.Pramanik, D. C Joshi, A. Meher and S. Thota

Research Conclave-2018, 8-11 March 2018, IIT Guwahati, India

High frequency ac-electrical transport studies of ferroelectric KNaNbO3 and CuO composites

T.A. Dar, D.C. Joshi, S. Nayak, R.T. George, S. Ghosh , S. Thota

International Conference on Systems and Processes in Physics, Chemistry and Biology (ICSPPCB- 2018), 1-3 March, 2018, Silchar, Assam, India

Optical and Magnetization studies MnCo2-pCupO4 Ferrimagnetic Spinels

P.Pramanik, D. C. Joshi, and S. Thota

International Conference on Advanced Functional Materials (ICAFM 2017) 18-20, December, 2017, RGUKT, Basar, Nirmal-504107, Telangana State, India

Lead-free Ferroelectric KNbO3-NiO Two-Phase Composite

R. Soni, R. George, DC Joshi, P. Pramanik, S. Nayak, S. Ghosh, and S. Thota

Research Conclave-2018, 17-20 March 2017, IIT Guwahati, India

Vibrational Excitations in Ferrimagnetic Spinel MnCo2O4

P. Pramanik, D. C. Joshi, S. Ghosh, T. A. Dar, R. T. George, and S. Thota

National Workshop on Fluorescence and Raman Spectroscopy December 17-21, 2017, IIT Guwahati-781039, India

Investigation of the Structural and Dielectric properties of Antiferromagnetic CoO containing Wurtzite ZnO

M. M. Alom, S. Ghosh, D. C. Joshi, S. Nayak, P. Pramanik and S. Thota/span>

Research Conclave-2017, 17-20 March 2017, IIT Guwahati, India

Dielectric Behavior of Lead-free Ferroelectric NaNbO3-NiO Two-Phase Composits

R. T. George, D. C Joshi, R. Soni, P. Pramanik, S. Nayak, and S. Thota/span>

Research Conclave-2017, 17-20 March 2017, IIT Guwahati, India

High Frequency Dielectric Studies of Sodium Doped Mott-Insulators

S. Biswas, D. C. Joshi, T. Nagendrababu, P. Pramanik, S. Ghosh, T. A. Dar and S. Thota

5th International Conference on Advanced Nanomaterial and Nanotechnology (ICANN-2017),IIT Guwahati-781039, India

Raman Spectroscopic Studies of Piezoelectric Alkaline Niobate

R. T. George, S. Nayak, D. C. Joshi, S. Ghosh, T. A. Dar, and S. Thota

National Workshop on Fluorescence and Raman Spectroscopy December 17-21, 2017, IIT Guwahati-781039, India

High temperature Dielectric behavior of KNaNbO3 and CuO composites

T. A. Dar, D. C. Joshi, R. T. George and S.Thota

5th International Conference on Advanced Nanomaterial and Nanotechnology (ICANN-2017),IIT Guwahati-781039, India

The role of Na doping on the Antiferromagnetic ordering of NiO

D. C. Joshi, P.Pramanik, and S. Thota

International Conference on Advanced Functional Materials (ICAFM 2017) 18-20, December, 2017, RGUKT, Basar, Nirmal-504107, Telangana State, India

On the Vibrational Excitations in Ferroelectric KNbO3 and Antiferromagnetic MgMnO3 Composites

S. Nayak, R. Soni, R.T. George, T.A. Dar, D. C. Joshi, S.Thota

5th International Conference on Advanced Nanomaterial and Nanotechnology (ICANN-2017),IIT Guwahati-781039, India

Structural and Micro-Raman studies of Ferroelectric KNaNbO3 and CuO composites

T. A. Dar, D. C. Joshi, S. Nayak, R. T. George, S. Ghosh, and S. Thota

National Workshop on Fluorescence and Raman Spectroscopy December 17-21, 2017, IIT Guwahati-781039, India

Structural and Magnetic properties of Al doped Cobalt Orthotitanate

S. Ghosh, S. Nayak, P. K. Mishra and S. Thota

5th International Conference on Advanced Nanomaterial and Nanotechnology (ICANN-2017),IIT Guwahati-781039, India

A dynamical study of lead-free KNaNbO3-MnO2

R. George, R.Soni, D.C. Joshi, P.Pramanik, S.Nayak, S.Pittala and S. Thota

International Conference on Nanomaterials and Nanotechnology (ICNANO-2017), 1-3 March 2017, VBRI-Allahabad, India

X-ray photoelectron spectroscopic studies of Na doped NiO

D. C. Joshi, S. Nayak, P. Pramanik, R. George, R. Soni, K. Dasari and S. Thota

UGC-SAP (DRS III) Sponsored National Seminar on Advances in Materials Science, 24-25 March 2017, Gauhati University, Guwahati-781014, Assam, India.

Mott Variable-Range Hopping Conduction Mechanism in Ferroelectric KNbO3-NiO

R.Soni, R. George, D.C. Joshi, P. Pramanik1, S. Nayak and S. Thota

International Conference on Nanomaterials and Nanotechnology (ICNANO-2017), 1-3 March 2017, VBRI-Allahabad, India

Thermal Hysteresis in NaNbO3-NiO Two-Phase Composites

R. George, R. Soni, D. C. Joshi, S. Nayak, P. Pramanik, S. Ghosh, and S. Thota

UGC-SAP (DRS III) Sponsored National Seminar on Advances in Materials Science, 24-25 March 2017, Gauhati University, Guwahati-781014, Assam, India.

Synthesis and Characterization of MgCo2O4 Nanorods for Fuel Cell Applications

S. Nayak, D. C. Joshi, P. Pramanik and S. Thota

International Conference on Nanomaterials and Nanotechnology (ICNANO-2017), 1-3 March 2017, VBRI-Allahabad, India

On the nature of diffused first-order phase transition in NaNbO3-MnO2 two-phase composites

R. Soni, D. C. Joshi, S. Nayak, P. Pramanik, R. George, S.Ghosh, and S. Thota

UGC-SAP (DRS III) Sponsored National Seminar on Advances in Materials Science, 24-25 March 2017, Gauhati University, Guwahati-781014, Assam, India.

Quantum-size effects in MnCo2O4 Nanocrystals

P. Pramanik, S. K. Singh, R. Soni, D. C. Joshi, S. Nayak and S. Thota

International Conference on Nanomaterials and Nanotechnology (ICNANO-2017), 1-3 March 2017, VBRI-Allahabad, India

Dynamic ac-conductivity studies of Cobalt-Orthotitanate

S.Nayak, J. Dhillon, S. K. Deshpande, D. C. Joshi, P. Pramanik, R. George, and S. Thota

UGC-SAP (DRS III) Sponsored National Seminar on Advances in Materials Science, 24-25 March 2017, Gauhati University, Guwahati-781014, Assam, India.

Ferrimagnetic behavior and Optical properties of MnCo2-pCupO4Nanostructures

P. Pramanik, D. C. Joshi, and S. Thota

National Conference on Nanomaterials and its Applications (NCNA-17), 20-21 Sept, 2017, Golaghat-785621, Assam, India.

Electronic structure and Dielectric studies of Na doped NiO

D. C. Joshi, P. Pramanik, T. Nagendrababu and S. Thota

National Conference on Nanomaterials and its Applications (NCNA-17), 20-21 Sept, 2017, Golaghat-785621, Assam, India.

Low-Temperature anomalous magnetic behavior of TiCo2O4

S. Thota, K. Dasari, S. Nayak, D. C. Joshi, P. Pramanik, A. Waske and T. Sarkar

5th IEEE International Conference on Microwave Magnetics, The University of AlabamaTuscaloosa, 5-8 June, 2016, AL, USA.

Compositional dependence of structural and X-ray photoelectron spectroscopic studies of Zn1-xNixO/NiO Two-Phase Composites

D. C. Joshi, S. Nayak, P. Pramanik, K. Dasari, R. Palai, Md. Qureshi and S. Thota

2nd International Conference on Materials Science and Technology, St. Thomas College Pala Arunapuram, Kottayam, Kerala, India

X-ray Photoelectron Spectroscopy and Optical properties of MnCo2O4 Nanostructures

P. Pramanik, D. C. Joshi, S. Nayak, S Sambasivam, B. C. Choi, and S. Thota

2nd International Conference on Materials Science and Technology, St. Thomas College Pala Arunapuram, Kottayam, Kerala, India

Structural and Magnetic properties of Cu doped Cobalt Orthotitanate

S. Nayak, D. C. Joshi, P. Pramanik, M. Krautz, A. Waske and S. Thota

2nd International Conference on Materials Science and Technology, St. Thomas College Pala Arunapuram, Kottayam, Kerala, India

The localized charge carrier transport properties of Zn1-xNixO/NiO (0.3 < x < 1) two-phase composites

D. C. Joshi, K. Dasari, S. Pittala, S. Nayak and S. Thota

57th Electronic Materials Conference, The Ohio State University, Columbus, Ohio, 24-25 June 2015, USA.

Effect of ‘Na' Doping on the Structural, Dielectric and Electronic Characteristics of Wide Band-Gap NiO (Conference Proceedings)

D. C. Joshi, K. Dasari, S. Nayak, P. Pramanik, P. Suresh, S. Pittala, and S. Thota

9TH WORKSHOP ON FRONTIER IN ELECTRONICS (WOFE-2015) & 2nd WORKSHOP ON MULTIFUNCTIONAL NANOMATERIALS (WMN-15) Dec 15-18, 2015, CARIBE HILTON HOTEL, San Juan, PR, USA

Micro-Raman and Electron Spin Resonance studies of Co3-xTixO4

S. Nayak, D. C. Joshi and S. Thota

2nd International Conference on Nanotechnology ICNT-2015 & Indo-USA joint symposium, Haldia (W.B), India

On the growth mechanism and Electron Spin Resonance studies of cubic-phase ZrO2 nanostructures stabilized with Cu2+

S. Thota, S. Nayak, A. Mallick, D. C. Joshi, S. Sambasivam and Md. Qureshi

2nd International Conference on Nanotechnology ICNT-2015 & Indo-USA joint symposium, Haldia (W.B), India

Growth mechanism and Electron-Spin-Resonance studies of Zn1-xNixO/NiO two-phase nanocomposite (IEEE Xplore Conference Proceedings)

D. C. Joshi, D.D. Harish, D. Roy, S. Nayak, Md. Qureshi, R.L.N. Sai prasad, T. Shiyani, D. Pamu, S. Thota

2nd IEEE International Conference on Emergin Electonics ICEE-2014, 3-6 December-2014, IISc Bangalore, Karnataka (India)

On the cubic phase stability and magnetic properties of Cu doped ZrO2 Bulletin of American Physical Society

S. Thota, K. Pisane, S. Singh, and M.S. Seehra, APS, 3-7 March 2014 Meeting, Denver Colorado (USA)

Effect of Cu doping on the magnetism of MnCo2O4 Cubic spinels Bulletin of American Physical Society

S. K. Singh, M.S. Seehra, and S. Thota, APS, 3-7 March 2014 Meeting, Denver Colorado (USA)

Broadband dielectric studies of Zn1-xNixO/NiO ceramics for varistor device applications

D. Dayapule, P. Mahesh, T.S. Kumar, D. Pamu and S. Thota

6th International conference on Nanoscience and Nanotechnology, Chandigarh, Punjab, India, March 3-5, (2014)

Dielectric spectroscopy of Dy2O3 doped (K0.5Na0.5)NbO3

P. Mahesh, S. Thota and D. Pamu

58th Department of Atomic Energy-Solid State Physics Symposium, Thapar University, India, Dec 17-21, (2013)

The role of surface effects on the optical behavior of nanocrystalline NiO

S. Thota, S. K. Singh, A. Mallick,(AIP Conference Proceedings, 1536, 521 (2013))

International Conference on Recent Trends in Applied Physics & Mat. Sc(RAM), Bikaner, India, Feb 1-2, 2013

Phase evaluation and Optical studies of ZrMnO2 and ZrCoO2 nanocrystallites

S. Thota, A. Ansari, A. Mallick, S. K. Singh, and J. Kumar (AIP Conference Proceedings, 1536, 113 (2013))

International Conference on Recent Trends in Applied Physics and Materials Science (RAM 2013), Bikaner, 1-2-2013

Memory effects and Relaxation dynamics of MnCo2O4

S. Thota, S. K. Das, A. Kumar, S. Sangaraju and B. C. Choi

IEEE International conference on Microwave magnets (ICMM), Kaiserslautern, Germany, Aug 26-29, 2012

Dielectric response of the complex spin ordering process in Mn3O4

S. Thota, K. Singh, D. Pamu, Ch. Simon and W. Prellier

The International conference on Nanoscience and Technology (ICONSAT), Hyderabad, India, Jan 20-23, 2012

Synthesis, structure, and magnetic analysis of the cubic defect spinel ZnMnO3

M. S. Seehra, J. D. Rall, S. Thota and J. Kumar

56 International conference on Magnetism and Magnetic Materials (MMM), Scottsdale, USA, Oct-30, 2011

Effect of annealing on the structural and optical properties of nanocrystalline MgTiO3 thin films

T. S. Kumar, R. K. Bhuyan, S. Thota, A. R. James and D. Pamu

The International conference on Nanoscience and Technology (ICONSAT), Hyderabad, India, Jan 20-23, 2012

Influence of binary mixed phase manganese oxides on the magnetic properties of Mn2O3 nanocrystallites

S. Thota, A. Kumar, T. Shiyani and J. Kumar

2nd International conference on Advanced Nanomaterials and Nanotechnology (ICANN-2011), IIT Guwahati, 8-12-11

Optical and magnetic studies of Zn1-2yNiyCoyO degenerate semi-magnetic semiconductors

S. Thota and J. Kumar AIP Conference Proceedings, 1447, 1047 (2012)

56th DAE-Solid State Physics Symposium, SRM University, India, December 19-23, 2011

Recent Progress in artificial superlattices

U. Luders, A. David, S. Thota, R. Fresard and W. Prellier

Abstracts of the 18th International Vacuum Congress, Beijing, China, August 23-27, 2010

Magnetocaloric effect and enhanced refrigeration efficiency in LaSrMnO3-SrRuO3 superlattices

Q. Zhang, S. Thota, F. Guillou, P. Padhan, V. Hardy, A. Wahl, and W. Prellier

Minerals, Metals and Materials Society AIME 420 commonwealth POBox430 Warrendale PA15086 USA

Magnetic structure and magnetocaloric properties of LaSrMnO3SrRuO3 superlattices

S. Thota, Q. Zhang and W. Prellier

European Materials Research Society (E-MRS) Spring Meeting, Strasburg, France, June 6-11, 2010

Comparative study of MgMoO nanopowders by sol-gel synthesis and solid state reaction

A. Kumar, S. Thota, K. N. Rai and J. Kumar

National conference on recent advances in condensed matter physics, Hamirpur, India, May 23-24, 2009

Magnetic behaviour of Manganese oxide nanoparticles obtained by thermal decomposition of sol-gel derived oxalates

S. Thota, B. Prasad and J. Kumar

Particles Based Advanced Materials, Orlando, USA, May 10-13, 2008

Evidence for Ferromagnetic ordering in PLD grown Zn1-xNixO/ZnO bilayer thin films

S. Thota, L. M Kukreja and J. Kumar

52nd International conference on Magnetism and Magnetic Materials (MMM), Tampa, FL, USA, Nov 4-9, 2007

Characteristics of PLD grown Zn1-xNixO/ZnO bi-layer thin-films

S. Thota, L. M. Kukreja and J. Kumar

4th National symposium on Pulsed Laser Ablation (PLD) of thin films and nanostructures materials meet organized by DAE-BRNS at Rajkot Gujarat, India October 3-5, 2007

Evidence for ferromagnetic ordering in nickel doped ZnO diluted magnetic semiconductor at room temperature

S. Thota, O. P. Singh, T. Dutta, and J. Kumar

International conference on MEMS and Semiconductor Nanotechnology, IIT Kharagpur, 20-23 Dec 2005 (India)