| Texto completo | |
| Autor(es): |
Samanta, Kousik
[1]
;
Souza, Jean C.
[1]
;
Rigitano, Danilo
[1]
;
Morales, Adimir I.
[1]
;
Pagliuso, Pascoal G.
[1]
;
Granado, Eduardo
[1]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] Univ Campinas UNICAMP, Gleb Wataghin Inst Phys, Campinas, SP - Brazil
Número total de Afiliações: 1
|
| Tipo de documento: | Artigo Científico |
| Fonte: | COMMUNICATIONS PHYSICS; v. 4, n. 1 MAY 10 2021. |
| Citações Web of Science: | 0 |
| Resumo | |
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) | |
| Processo FAPESP: | 18/11364-7 - Propriedades magnéticas de sistemas complexos com topologia não-trivial |
| Beneficiário: | Jean Carlo Souza |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 18/18653-4 - Busca de estados eletrônicos emergentes nos iridatos bidimensionais (Sr1-xAx)2IrO4 (A=CA, BA) |
| Beneficiário: | Adimir Italo Vilca Morales |
| Modalidade de apoio: | Bolsas no Brasil - Mestrado |
| Processo FAPESP: | 17/10581-1 - Fenômenos emergentes em sistemas de dimensões reduzidas |
| Beneficiário: | Pascoal Jose Giglio Pagliuso |
| Modalidade de apoio: | Auxílio à Pesquisa - Projetos Especiais |
| Processo FAPESP: | 16/00756-6 - Síntese e Investigação Fundamental de Novos Sistemas com Elétrons Correlacionados com Forte Acoplamento Spin-órbita |
| Beneficiário: | Kousik Samanta |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 18/20142-8 - Dinâmica vibracional, ondas de spin e excitações orbitais em óxidos de metais de transição |
| Beneficiário: | Eduardo Granado Monteiro da Silva |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |