Jeff=32 metallic phase and unconventional superconductivity in GaTa4Se8
Min Yong Jeong, Seo Hyoung Chang, Hyeong Jun Lee, Jae-Hoon Sim, Kyeong Jun Lee, Etienne Janod, Laurent Cario, Ayman Said, Wenli Bi, Philipp Werner, Ara Go, Jungho Kim, Myung Joon Han
DOI 10.1103/PhysRevB.103.L081112 · Physical Review B
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Abstract
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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| GaTa4Se8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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