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Synthesis and Fundamental Investigation of Novel Correlated Electron Systems with Strong Spin-orbit Coupling

Grant number: 16/00756-6
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): August 01, 2016
Effective date (End): July 31, 2019
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:Eduardo Granado Monteiro da Silva
Grantee:Kousik Samanta
Home Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Associated research grant:17/10581-1 - Emergent phenomena in reduced dimension systems, AP.TEM

Abstract

Materials that combine both strong electronic correlation and spin-orbit coupling offer opportunities for the discovery of new states of matter. Our aim in this project is to study complex 5d transition-metal oxides with an eye towards observing unusual phenomena such as topological Mott insulators, insulator to metal transitions, the so-called spin-liquid states, and unconventional high temperature superconductivity. We propose: (i) to synthesize single crystals of Ruddlesden-Popper series of iridates (Sr2IrO4 and Sr3Ir2O7) and doped Iridate Sr2Ir1-xTMxO4 (TM: Fe, Mn, Co, Ru) and Sr2-xAxIrO4 (A: La, K), (ii) to investigate the spin-orbital excitations and coupling of phonons with electronic (orbital ordering) and magnetic phase transitions, (iii) to investigate the role of electronic correlation in the formation of charge gap and the effect of doping on the electronic structure; and (iv) to search for new possible correlated electronic states. A variety of experimental techniques already mastered by our group will be used, including Raman scattering, x-ray absorption spectroscopy, and resonant magnetic x-ray diffraction.

Scientific publications
(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)
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 FEB 18 2020. Web of Science Citations: 0.
SAMANTA, K.; RIGITANO, D.; PAGLIUSO, P. G.; GRANADO, E. Isospin-phonon coupling and Fano-interference in spin-orbit Mott insulator Sr2IrO4. Applied Physics Letters, v. 114, n. 15 APR 15 2019. Web of Science Citations: 0.
SAMANTA, K.; ARDITO, F. M.; SOUZA-NETO, N. M.; GRANADO, E. First-order structural transition and pressure-induced lattice/phonon anomalies in Sr2IrO4. Physical Review B, v. 98, n. 9 SEP 4 2018. Web of Science Citations: 4.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.