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Vibrational dynamics, spin waves and orbital excitations in transition-metal oxides


Remarkable collective effects in Condensed Matter Physics, such as superconductivity and colossal magnetoresistance, among others, occur in transition-metal oxides, where there is frequently a coupling of electronic degrees of freedom (spin, orbital and charge) between themselves and with the crystal lattice. In these cases, not only the electronic and structural ground states, but also the corresponding excitations (phonons, magnons, orbitons) may, in principle, be coupled and have mixed character. In the project we will investigate ground states and excitations in such systems employing Raman spectroscopy, complemented by other techniques such as Resonant Inelastic X-Ray Scattering (RIXS), Neutron Diffraction and Elastic/Inelastic Scattering, X-Ray Absorption (XANES, EXAFS, XLD, XMCD, etc), High-Resolution X-Ray Diffraction, Resonant/Magnetic X-Ray Diffraction, among others, exploring whenever applicable the coupling between the different involved degrees of freedom. (AU)

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Scientific publications (6)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
GALDINO, C. W.; FREITAS, D. C.; MEDRANO, C. P. C.; TARTAGLIA, R.; RIGITANO, D.; OLIVEIRA, J. F.; MENDONCA, A. A.; GHIVELDER, L.; CONTINENTINO, M. A.; SANCHEZ, D. R.; et al. Magnetic, electronic, structural, and thermal properties of the Co3O2BO3 ludwigite in the paramagnetic state. Physical Review B, v. 100, n. 16, . (18/20142-8)
RIGITANO, D.; VAKNIN, D.; BARBERIS, G. E.; GRANADO, E.. Raman scattering from one and two magnons in magnetoelectric LiNiPO4. Physical Review B, v. 101, n. 2, . (17/10581-1, 18/20142-8)
SAMANTA, K.; TARTAGLIA, R.; KANEKO, U. F.; SOUZA-NETO, N. M.; GRANADO, E.. Anisotropic lattice compression and pressure-induced electronic phase transitions in Sr2IrO4. Physical Review B, v. 101, n. 7, . (17/10581-1, 16/00756-6, 18/20142-8)
GRANADO, E.; CEZAR, J. C.; AZIMONTE, C.; GOPALAKRISHNAN, J.; RAMESHA, K.. Electronic structure of Fe and magnetism in the 3d/5d double perovskites Ca2FeReO6 and Ba2FeReO6. Physical Review B, v. 99, n. 19, . (17/10581-1, 18/20142-8)
GALDINO, C. W.; FREITAS, D. C.; MEDRANO, C. P. C.; SANCHEZ, D. R.; TARTAGLIA, R.; RABELLO, L. P.; MENDONCA, A. A.; GHIVELDER, L.; CONTINENTINO, M. A.; ZAPATA, M. J. M.; et al. Structural and spectroscopic investigation of the charge-ordered, short-range ordered, and disordered phases of the Co3O2BO3 ludwigite. Physical Review B, v. 104, n. 19, . (18/20142-8)
SAMANTA, KOUSIK; SOUZA, JEAN C.; RIGITANO, DANILO; MORALES, ADIMIR I.; PAGLIUSO, PASCOAL G.; GRANADO, EDUARDO. Quantum criticality in a layered iridate. COMMUNICATIONS PHYSICS, v. 4, n. 1, . (18/11364-7, 18/18653-4, 17/10581-1, 16/00756-6, 18/20142-8)

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