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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Anisotropic lattice compression and pressure-induced electronic phase transitions in Sr2IrO4

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Samanta, K. [1] ; Tartaglia, R. [1] ; Kaneko, U. F. [2] ; Souza-Neto, N. M. [2] ; Granado, E. [1]
Total Authors: 5
[1] Univ Estadual Campinas, Gleb Wataghin Inst Phys, UNICAMP, BR-13083859 Campinas, SP - Brazil
[2] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Synchrotron Light Lab LNLS, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Physical Review B; v. 101, n. 7 FEB 18 2020.
Web of Science Citations: 0

The crystal lattice of Sr2IrO4 is investigated with synchrotron x-ray powder diffraction under hydrostatic pressures up to P = 43 GPa and temperatures down to 20 K. The tetragonal unit cell is maintained over the whole investigated pressure range, within our resolution and sensitivity. The c-axis compressibility kappa(c)(P, T) -(1/c)(dc/dP) presents an anomaly with pressure at P-1 = 17 GPa at fixed T = 20 K that is not observed at T = 300 K, whereas kappa(a)(P, T) is nearly temperature independent and shows a linear behavior with P. The anomaly in kappa(c)(P, T) is associated with the onset of long-range magnetic order, as evidenced by an analysis of the temperature dependence of the lattice parameters at fixed P = 13.7 +/- 0.5 GPa. At fixed T = 20 K, the tetragonal elongation c/a(P, T) shows a gradual increment with pressure and a depletion above P-2 = 30 GPa that indicates an orbital transition and possibly marks the collapse of the J(eff) = 1/2 spin-orbit-entangled state. Our results support pressure-induced phase transitions or crossovers between electronic ground states that are sensed, and therefore can be probed, by the crystal lattice at low temperatures in this prototype spin-orbit Mott insulator. (AU)

FAPESP's process: 17/10581-1 - Emergent phenomena in reduced dimension systems
Grantee:Pascoal Jose Giglio Pagliuso
Support type: Research Projects - Thematic Grants
FAPESP's process: 16/00756-6 - Synthesis and Fundamental Investigation of Novel Correlated Electron Systems with Strong Spin-orbit Coupling
Grantee:Kousik Samanta
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 18/20142-8 - Vibrational dynamics, spin waves and orbital excitations in transition-metal oxides
Grantee:Eduardo Granado Monteiro da Silva
Support type: Regular Research Grants