Orbital magnetism in double perovskite compounds under extreme conditions by synch...
Investigating strongly correlated electron systems in large multiuser facilities
Floquet engineering of realistic models for frustrated magnets
| Full text | |
| Author(s): |
Samanta, Kousik
[1]
;
Souza, Jean C.
[1]
;
Rigitano, Danilo
[1]
;
Morales, Adimir I.
[1]
;
Pagliuso, Pascoal G.
[1]
;
Granado, Eduardo
[1]
Total Authors: 6
|
| Affiliation: | [1] Univ Campinas UNICAMP, Gleb Wataghin Inst Phys, Campinas, SP - Brazil
Total Affiliations: 1
|
| Document type: | Journal article |
| Source: | COMMUNICATIONS PHYSICS; v. 4, n. 1 MAY 10 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
Iridates provide a fertile ground to investigate correlated electrons in the presence of strong spin-orbit coupling. Bringing these systems to the proximity of a metal-insulator quantum phase transition is a challenge that must be met to access quantum critical fluctuations with charge and spin-orbital degrees of freedom. Here, electrical transport and Raman scattering measurements provide evidence that a metal-insulator quantum critical point is effectively reached in 5% Co-doped Sr2IrO4 with high structural quality. The dc-electrical conductivity shows a linear temperature dependence that is successfully captured by a model involving a Co acceptor level at the Fermi energy that becomes gradually populated at finite temperatures, creating thermally-activated holes in the J(eff)=1/2 lower Hubbard band. The so-formed quantum critical fluctuations are exceptionally heavy and the resulting electronic continuum couples with an optical phonon at all temperatures. The magnetic order and pseudospin-phonon coupling are preserved under the Co doping. This work brings quantum phase transitions, iridates and heavy-fermion physics to the same arena. Due to a combination of strong spin orbit coupling and electron correlations iridates such as Sr2IrO4 exhibit a range of exotic quantum states that can be tuned via their electronic and magnetic properties. Here, the authors investigate the resistive and Raman scattering properties of Co-doped Sr2IrO4 and provide evidence for quantum critical fluctuations in the system. (AU) | |
| FAPESP's process: | 18/11364-7 - Magnetic properties of complex systems with non-trivial topology |
| Grantee: | Jean Carlo Souza |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 18/18653-4 - Search for emergent electronic states in the two-dimensional Iridates (Sr1-xAx)2IrO4 (A=Ca, BA) |
| Grantee: | Adimir Italo Vilca Morales |
| Support Opportunities: | Scholarships in Brazil - Master |
| FAPESP's process: | 17/10581-1 - Emergent phenomena in reduced dimension systems |
| Grantee: | Pascoal Jose Giglio Pagliuso |
| Support Opportunities: | Special Projects |
| FAPESP's process: | 16/00756-6 - Synthesis and Fundamental Investigation of Novel Correlated Electron Systems with Strong Spin-orbit Coupling |
| Grantee: | Kousik Samanta |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 18/20142-8 - Vibrational dynamics, spin waves and orbital excitations in transition-metal oxides |
| Grantee: | Eduardo Granado Monteiro da Silva |
| Support Opportunities: | Regular Research Grants |