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Search for emergent electronic states in the two-dimensional Iridates (Sr1-xAx)2IrO4 (A=Ca, BA)

Grant number: 18/18653-4
Support type:Scholarships in Brazil - Master
Effective date (Start): January 01, 2019
Effective date (End): September 30, 2020
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:Eduardo Granado Monteiro da Silva
Grantee:Adimir Italo Vilca Morales
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


Electron correlation and spin-orbit coupling are ingredients that may endow materials with attractive properties. In this project, we will study variations of a particularly interesting material of this class: Sr2IrO4. Although this family is known to present a fermiology that is similar to cuprates, superconductivity under charge doping has not been observed so far, suggesting the existence of other electronic phases that may compete with superconductivity. A recent Raman scattering and x-ray powder diffraction work by our group shows that application of pressures above ~16 GPa leads to a four-fold symmetry breaking electronic instability in pure Sr2IrO4, which was interpreted in terms of a possible emerging charge-density wave phase at the onset of the metallic phase. In this Masters project, we propose to advance on this topic and carry out isoelectronic cation substitutions in the Sr site, thus obtaining (Sr1-xCax)2IrO4 and (Sr1-xBax)2IrO4 compounds for several x. We intend to synthesize powders and single crystals of these materials and characterize them mainly by Raman scattering. The effects of such chemical pressure will be compared to those previously obtained under physical pressure, providing additional insight into the emerging states that may develop in this system under physical or chemical perturbations. (AU)