J(eff)=3/2 metallic phase and unconventional superconductivity in GaTa4Se8open access
- Authors
- Jeong, Min Yong; Chang, Seo Hyoung; Lee, Hyeong Jun; Sim, Jae-Hoon; Lee, Kyeong Jun; Janod, Etienne; Cario, Laurent; Said, Ayman; Bi, Wenli; Werner, Philipp; Go, Ara; Kim, Jungho; Han, Myung Joon
- Issue Date
- Feb-2021
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW B, v.103, no.8
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 103
- Number
- 8
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/48085
- DOI
- 10.1103/PhysRevB.103.L081112
- ISSN
- 2469-9950
2469-9969
- 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 J(eff) = 3/2 insulator GaTa4Se8. Its metallic phase, derived from the Mott state by applying pressure, is found to carry J(eff) = 3/2 moments. The characteristic excitation peak in the RIXS spectrum maintains its destructive quantum interference of J(eff) at the Ta L-2 edge up to 10.4 GPa. Our exact diagonalization-based DFT DMFT calculations including spin-orbit coupling also reveal that the J(eff) = 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 J(eff) = 3/2 moments residing in a metal. They also indicate that the pressure-induced superconductivity is likely unconventional and influenced by these J(eff) = 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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