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Research interests
Research interests
Heavy fermion systems
Kondo effect and valence fluctuations
Quantum phase transitions and related phenomena
Unconventional superconductivity
Charge density wave systems
Crystalline electric field (CEF) effects
Topological materials
Spin glass systems
New materials and artificial structures
Fig. from M. A. Continentino, Braz. J. Phys. 35, 197 (2005).
Current main research projects
Current main research projects
Charge order and electronic fluctuations in new superconducting systems
Charge order and electronic fluctuations in new superconducting systems
The coexistence of superconductivity with competing physical phenomena, such as magnetic or charge order, has been of interest to the condensed matter community for a long time. For example, metals' superconductor and charge density wave (CDW) states are two different cooperating electronic states that stem from electron-phonon coupling and Fermi surface instabilities. Superconductivity is often observed in CDW materials. However, its interaction with the CDW charge order must still be better understood. In this work proposal, we plan to investigate the phenomenon of charge ordering in condensed matter systems in new superconductors. More specifically, we will study the occurrence of superconducting phases and charge order in compounds AV3Sb5 (A = K, Rb, or Cs) and La3Ni2O7. Understanding these electronic orders and fluctuations sheds light on fundamental aspects of condensed matter physics and offers possible avenues for designing materials with on-demand electronic properties.
Exotic magnetism in double-perovskites materials
Exotic magnetism in double-perovskites materials
For transition metal oxides with magneto-electronic coupling, the double-perovskite oxides, with general formula A2BB’O6 (A=rare-earth/earth-alkaline; B,B’= transition metals) stand out. In these compounds, there is a strong correlation between the structural, electronic, and magnetic properties. Notably, most transition metals are pretty sensitive to their oxidation state, crystalline electric field, and structural point symmetry, presenting high spin, low spin, or even the so-called intermediate spin configurations. These competing features in such double-perovskite oxides allow the emergence of distinct kinds of exotic magnetic and electronic properties in these systems, such as the zero-field-cooled exchange bias (ZEB) effect. Although different scenarios argue to explain such effect on distinct systems, all ZEB materials described so far have the reentrant spin glass behavior as a standard feature characterized by a spin glass state concomitant with a conventional magnetic phase. Despite the requirement of the presence of a reentrant spin-glass phase, the microscopic mechanisms that govern the ZEB effect phenomenon are not yet understood. In this context, we will study single-crystalline double-perovskite to understand the grain/domains and interface coupling roles for the ZEB effect observed in polycrystals.
Recent highlighted results
Recent highlighted results
Essential aspects of the spontaneous exchange bias effect (REVIEW ARTICLE)
Work in collaboration with UFG-Brazil
Journal of Magnetism and Magnetic Materials 599, 72109 (2024)
Tuning the spontaneous exchange bias effect in La1.5Sr0.5CoMnO6 with sintering temperature
Work in collaboration with NIST and ORNL (USA), LNLS, UFF, and UFG (Brazil)
Physical Review Materials 8, 044408 (2024)
Absence of zero-field-cooled exchange bias effect in single crystalline La2-xAxCoMnO6 (A = Ca, Sr) compounds
Work in collaboration with U. Warwick-UK and UFG-Brazil
Unveiling charge density wave quantum phase transitions by x-ray diffraction
Work in collaboration with DESY-Germany, University College London-UK and UERJ-Brazil
Possible quantum fluctuations in the vicinity of the quantum critical point of (Sr,Ca)3Ir4Sn13 revealed by high-energy x-ray diffraction
Work in collaboration with DESY-Germany, University College London-UK and UNICAMP-Brazil
Influence of spin glass-like magnetic relaxation on the zero-field-cooled exchange bias effect
Work in collaboration with UFG-Brazil
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