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Jeong, M. Y., Chang, S. H., Lee, H. J., Sim, J.-H., Lee, K. J., Janod, E., Cario, L., Said, A., Bi, W., Werner, P., Go, A., Kim, J. & Han, M. J. (2021) J(eff)=3/2 metallic phase and unconventional superconductivity in GaTa4Se8. Phys. Rev. B, 103 L081112.
Added by: Richard Baschera (2021-03-18 12:59:25) Last edited by: Richard Baschera (2021-03-18 13:01:47) |
| Type de référence: Article DOI: 10.1103/PhysRevB.103.L081112 Clé BibTeX: Jeong2021 Voir tous les détails bibliographiques  |
Catégories: INTERNATIONAL, PMN Créateurs: Bi, Cario, Chang, Go, Han, Janod, Jeong, Kim, Lee, Lee, Said, Sim, Werner Collection: Phys. Rev. B |
Consultations : 1/386
Indice de consultation : 7% Indice de popularité : 1.75% |
| Liens URLs https://link.aps.o ... ysRevB.103.L081112 |
| Résumé |
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By means of density functional theory plus dynamical mean-field theory (DFT + DMFT) calculations and resonant inelastic x-ray scattering (RIXS) experiments, we investigate the high-pressure phases of the spin-orbit-coupled Jeff=3/2 insulator GaTa4Se8. Its metallic phase, derived from the Mott state by applying pressure, is found to carry Jeff=3/2 moments. The characteristic excitation peak in the RIXS spectrum maintains its destructive quantum interference of Jeff at the Ta L2 edge up to 10.4 GPa. Our exact diagonalization-based DFT + DMFT calculations including spin-orbit coupling also reveal that the Jeff=3/2 character can be clearly identified under high pressure. These results establish the intriguing nature of the correlated metallic magnetic phase, which represents the first confirmed example of Jeff=3/2 moments residing in a metal. They also indicate that the pressure-induced superconductivity is likely unconventional and influenced by these Jeff=3/2 moments. Based on a self-energy analysis, we furthermore propose the possibility of doping-induced superconductivity related to a spin-freezing crossover.
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Publisher: American Physical Society
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