Single crystal growth

Heavy fermions / Unconventional superconductivity / Frustrated low-dimensional spin system

High magnetic fields

1. In Situ Modification of a Delafossite-Type PdCoO₂ Bulk Single Crystal for Reversible Hydrogen Sorption and Fast Hydrogen Evolution

Guowei Li, Seunghyun Khim, Celesta S Chang, Chenguang Fu, Nabhanila Nandi, Fan Li, Qun Yang, Graeme R Blake, Stuart Parkin, Gudrun Auffermann, Yan Sun, David A Muller, Andrew P Mackenzie, Claudia Felser

ACS Energy Lett. 4, 2185 (2019)

2. h/e Oscillations in Interlayer Transport of Delafossites

Carsten Putzke, Maja D. Bachmann, Philippa McGuinness, Elina Zhakina, Takashi Oka, Roderich Moessner, Markus König, Seunghyun Khim, Andrew P. Mackenzie, Philip J. W. Moll

arXiv:1902.07331

3. Super-geometric electron focusing on the hexagonal Fermi surface of PdCoO₂

Maja D. Bachmann, Aaron L. Sharpe, Arthur W. Barnard, Carsten Putzke, Markus König, Seunghyun Khim, David Goldhaber-Gordon, Andrew P. Mackenzie and Philip J. W. Moll

Nature Communications 10, 5081 (2019).

4. Magnetic frustration and spontaneous rotational symmetry breaking in PdCrO₂

Dan Sun, Dmitry A. Sokolov, Jack M. Bartlett, Jhuma Sannigrahi, Seunghyun Khim, Pallavi Kushwaha, Dmitry D. Khalyavin, Pascal Manuel, Alexandra S. Gibbs, Hidenori Takagi, Andrew P. Mackenzie, and Clifford W. Hicks

Phys. Rev. B 100, 094414(2019)

5. Field-induced instability of the quantum spin liquid ground state in the J_eff=1/2 triangular-lattice compound NaYbO₂

K. M. Ranjith, D. Dmytriieva, S. Khim, J. Sichelschmidt, S. Luther, D. Ehlers, H. Yasuoka, J. Wosnitza, A. A. Tsirlin, H. Kühne, and M. Baenitz

Phys. Rev. B 99, 180401(2019)

6. Perfect separation of intraband and interband excitations in PdCoO₂

C. C. Homes, S. Khim, and A. P. Mackenzie

Phys. Rev. B 99, 195127 (2019)

7. Probing spin correlations using angle resolved photoemission in a coupled metallic/Mott insulator system

V. Sunko, F. Mazzola, S. Kitamura, S. Khim, P. Kushwaha, O.J. Clark, M. Watson, I. Markovic, D. Biswas, L. Pourovskii, T.K. Kim, T.-L. Lee, P.K. Thakur, H.Rosner, A. Georges, R. Moessner, T. Oka, A.P. Mackenzie, P.D.C. King

arXiv:1809.08972

8. Unconventional magneto-transport in ultrapure PdCoO₂ and PtCoO₂

Nabhanila Nandi, Thomas Scaffidi, Pallavi Kushwaha, Seunghyun Khim, Mark E. Barber, Veronika Sunko, Federico Mazzola, Philip D. C. King, Helge Rosner, Philip J. W. Moll, Markus König, Joel E. Moore, Sean Hartnoll, Andrew P. Mackenzie

npj Quantum Materials 3, 66 (2018)

9. Itinerant ferromagnetism of the Pd-terminated polar surface of PdCoO₂

Federico Mazzola, Veronika Sunko, Seunghyun Khim, Helge Rosner, Pallavi Kushwaha, Oliver J. Clark, Lewis Bawden, Igor Marković, Timur K. Kim, Moritz Hoesch, Andrew P. Mackenzie, and Phil D. C. King

PNAS 115, 12956 (2018)

10. Maximal Rashba-like spin splitting via kinetic energy-driven inversion symmetry breaking

Veronika Sunko, H. Rosner, P. Kushwaha, S. Khim, F. Mazzola, L. Bawden, O. J. Clark, J. M. Riley, D. Kasinathan, M. W. Haverkort, T. K. Kim, M. Hoesch, J. Fujii, I. Vobornik, A. P. Mackenzie, P. D. C. King

Nature 549, 492 (2017)

11. Quasi two-dimensional Fermi surface topography of the delafossite PdRhO­₂

Frank Arnold, Marcel Naumann, Seunghyun Khim, Helge Rosner, Veronika Sunko, Federico Mazzola, Philip D.C. King, Andrew P. Mackenzie and Elena Hassinger

Phys. Rev. B 96, 075163 (2017)

12. Single crystal growth, structure and electronic properties of metallic delafossite PdRhO₂

P. Kushwaha, H. Borrmann, S. Khim, H. Rosner, P.J.W. Moll, D. A. Sokolov, V. Sunko, Yu. Grin, and A.P. Mackenzie

Cryst. Growth Des. 17, 4144 (2017)

13. Increasing stripe-type fluctuations in AFe₂As₂ (A = K, Rb, Cs) superconductors probed by ⁷⁵As NMR spectroscopy

Z. T. Zhang, D. Dmytriieva, S. Molatta, J. Wosnitza, S. Khim, S. Gass, A. U. B. Wolter, S. Wurmehl, H.-J. Grafe, and H. Kühne

Phys. Rev. B 97, 115110 (2018)

14. Experimental realization of type-II Weyl state in non-centrosymmetric TaIrTe₄

E. Haubold, K. Koepernik, D. Efremov, S. Khim, A. Fedorov, Y.Kushnirenko, J. van den Brink, S. Wurmehl, B. Büchner, T. K.Kim, M. Hoesch, K. Sumida, K. Taguchi, T. Yoshikawa, A. Kimura, T. Okuda, S. V. Borisenko

Phys. Rev. B 95, 241108 (2017)

15. Magnetotransport and de Haas-van Alphen measurements in the type-II Weyl semimetal TaIrTe₄

Seunghyun Khim, Klaus Koepernik, Dmitry V. Efremov, J. Klotz, T. Förster, J. Wosnitza, Mihai I. Sturza, Sabine Wurmehl, Christian Hess, Jeroen van den Brink, Bernd Büchner

Phys. Rev. B 94, 165145 (2016)

16. A calorimetric investigation of RbFe₂As₂ single crystals

Seunghyun Khim, Saicharan Aswartham, Vadim Grinenko, Dmitry Efremov, Christian G. F. Blum, Frank Steckel, Daniel Gruner, Anja UB Wolter, Stefan‐Ludwig Drechsler, Christian Heß, Sabine Wurmehl, Bernd Büchner

Physica Status Solidi (b) 254, 1600208 (2017)

17. Unusual magnetotransport properties in a FeAs single crystal

Seunghyun Khim, Matthias Gillig, Rüdiger Klingeler, Sabine Wurmehl, Bernd Büchner, Christian Hess

Phys. Rev. B 93, 025129 (2016)

18. TaIrTe₄: A ternary type-II Weyl semimetal

K. Koepernik, D. Kasinathan, D. V. Efremov, Seunghyun Khim, Sergey Borisenko, Bernd Büchner, Jeroen van den Brink

Phys. Rev. B 93, 201101 (2016)

19. Unconventional Andreev reflection on the quasi-one-dimensional superconductor Nb₂Pd_xSe₅

Yeping Jiang, Xiaohang Zhang, Seunghyun Khim, Dilip Bhoi, Kee Hoon Kim, Richard L Greene, Ichiro Takeuchi

AIP Advances 6, 045210 (2016)

20. Interplay of charge density wave and multiband superconductivity in 2H-Pd_xTaSe₂

D. Bhoi, Seunghyun Khim, W. Nam, B. S. Lee, Chanhee Kim, B. -G. Jeon, B. H. Min, S. Park, Kee Hoon Kim

Scientific reports 6, 24068 (2016)

21. Manifestation of magnetic quantum fluctuation in multiferroic Ba₂CoGe₂O₇

Jae Wook Kim, Seunghyun Khim, Sae Hwan Chun, Y. Jo, L. Balicas, H. Yi, S. –W. Chung, N. Harrison, C. D. Batista, Jung Hoon Han and Kee Hoon Kim

Nature Communications 5, 4419 (2014)

22. Enhanced density of states in Li(Fe_1−xCo_x)As single crystals near x = 0.06 as implied by transport properties

Bumsung Lee, Seunghyun Khim, Byung-Jo Jeon, Ju-Young Park, Suk Ho Lee, Ki-Young Choi, GR Stewart, Kee Hoon Kim

Physica C: Superconductivity 495, 130 (2013)

23. Enhanced Upper Critical Fields in a New Quasi-one-dimensional Superconductor Nb₂Pd_xSe₅

Seunghyun Khim, Bumsung Lee, Ki-Young Choi, Byung-Gu Jeon, Dong Hyun Jang, Deepak Patil, Seema Patil, Rokyeon Kim, Eun Sang Choi, Seongsu Lee, Jaejun Yu and Kee Hoon Kim

New Journal of Physics 15, 123031 (2013).

24. Orbital Selective Fermi Surface Shifts and Mechanism of High Tc Superconductivity in Correlated AFeAs (A = Li, Na)

Geunsik Lee, Hyo Seok Ji, Yeongkwan Kim, Changyoung Kim, Kristjan Haule, Gabriel Kotliar, Bumsung Lee, Seunghyun Khim, Kee Hoon Kim, Kwang S. Kim, Ki-Seok Kim, and Ji Hoon Shim

Phys. Rev. Lett. 86, 165205 (2012)

25. Probing the order parameter of superconducting LiFeAs using Pb/LiFeAs and Au/LiFeAs point-contact spectroscopy

Xiao hang Zhang, Bumsung Lee, Seunghyun Khim, Kee Hoon Kim, Richard L. Greene and Ichiro Takeuchi

Phys. Rev. B 85, 094521 (2012)

26. Revealing the dual nature of magnetism in iron pnictides and iron chalcogenides using x-ray emission spectroscopy

H. Gretarsson, A. Lupascu, Jungho Kim, D. Casa, T. Gog, W. Wu, S. R. Julian, Z. J. Xu, J. S. Wen, G. D. Gu, R. H. Yuan, Z. G. Chen, N.-L. Wang, S. Khim, K. H. Kim, M. Ishikado, I. Jarrige, S. Shamoto, J.-H. Chu, I. R. Fisher, Young-June Kim

Phys. Rev. B 84, 100509(R) (2011)

27. Magnetic field-dependent Labusch parameter in LiFeAs superconductor from Campbell penetration depth

Plengchart Prommapan, Makariy A. Tanatar, Bumsung Lee, Seunghyun Khim, Kee Hoon Kim, Ruslan Prozorov

Phys. Rev. B 84, 060509 (2011)

28. Pauli-limiting effects in the upper critical fields of a clean LiFeAs single crystal

Seunghyun Khim, Bumsung Lee, Jae Wook Kim, Eun Sang Choi, G. R. Stewart and Kee Hoon Kim

Phys. Rev. B 84, 104502 (2011)

29. Observation of two-gap superconductivity in SrFe_1.85Co_0.15As₂ single crystals by scanning tunneling microscopy and spectroscopy

Jewook Park, Seunghyun Khim, Gun Sang Jeon, Jun Sung Kim, Kee Hoon Kim and K. Char

New Journal of Physics 13, 033005 (2011)

30. Electronic structure of detwinned BaFe₂As₂ from photoemission and first principles

Yeongkwan Kim, Hyungju Oh, Chul Kim, Dongjoon Song, Wonsig Jung, Beomyoung Kim, Hyoung Joon Choi, Changyoung Kim, Bumsung Lee, Seunghyun Khim, Hyungjoon Kim, Keehoon Kim, Jongbeom Hong, and Yongseung Kwon

Phys. Rev. B 83, 064509 (2011)

31. Single crystal growth and superconducting properties of LiFeAs

Bumsung Lee, Seunghyun Khim, Jung Soo Kim, G. R. Stewart, and Kee Hoon Kim

Europhysics Letters 91, 67002 (2010)

32. Electron-hole asymmetry in Co- and Mn-doped SrFe₂As₂

J. S. Kim, Seunghyun Khim, H. J. Kim, M. J. Eom, J. M. Law, R. K. Kremer, Ji Hoon Shim, and Kee Hoon Kim

Phys. Rev. B 82, 024510 (2010)

33. Dual character of magnetism in EuFe₂As₂: Optical spectroscopic and density-functional calculation study

S.J. Moon, J.H. Shin, D. Parker, W.S. Choi, I.I. Mazin, Y.S. Lee, J.Y. Kim, B.K. Cho, S.H. Khim, J.S. Kim, K.H. Kim, and T.W. Noh

Phys. Rev. B 81, 205114 (2010)

34. Evidence for dominant Pauli paramagnetic effect in the upper critical field of single-crystalline FeTe_0.6Se_0.4

Seunghyun Khim, Jae Wook Kim, Eun Sang Choi, Yunkyu Bang, Minoru Nohara, Hidenori Takagi, and Kee Hoon Kim

Phys. Rev. B 81, 184511 (2010)

35. Nearly isotropic upper critical fields in a SrFe_1.85Co_0.15As₂ single crystal

Seunghyun Khim, Jun Sung Kim, Jae Wook Kim, Suk Ho Lee, F. F. Balakirev, Yunkyu Bang, Kee Hoon Kim

Physica C 470, S317 (2010) (Proceedings of the 9th International Conference on Materials and Mechanisms of Superconductivity)

36. Strong reduction of the Korringa relaxation in the spin-density wave regime of EuFe₂As₂ observed by electron spin resonance

E. Dengler, J. Deisenhofer, H.-A. Krug von Nidda, Seunghyun Khim, J. S. Kim, Kee Hoon Kim, F. Casper, and A. Loidl

Phys. Rev. B 81, 024406 (2010)

37. Evidence for Coexistence of Superconductivity and Magnetism in Single Crystals of Co-doped SrFe₂As₂

Jun Sung Kim, Seunghyun Khim, Liqin Yan, N. Manivannan, Yong Liu, Ingyu Kim, G. R. Stewart, and Kee Hoon Kim

J. Phys.: Condens. Matter 21, 102203 (2009)

38. Vortex-glass phase transition and superconductivity in an under-doped (Ba,K)Fe₂As₂ single crystal

Hyeong-Jin Kim, Y. Liu, Yoon-Seok Oh, Seunghyun Khim, Ingyu Kim, G. Stewart, and Kee Hoon Kim

Phys. Rev. B 79, 014514 (2009)