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• W3188769791 abstract "Abstract The quantum spin liquid candidate NaYbSe 2 was recently reported to exhibit a Mott transition under pressure. Superconductivity was observed in the high-pressure metallic phase, raising the question concerning its relation with the low-pressure quantum spin liquid ground state. Here we combine the density functional theory and the dynamical mean-field theory to explore the underlying mechanism of the insulator-to-metal transition and superconductivity and establish an overall picture of its electronic phases under pressure. Our results suggest that NaYbSe 2 is a charge-transfer insulator at ambient pressure. Upon increasing pressure, however, the system first enters a semi-metallic state with incoherent Kondo scattering against coexisting localized Yb-4 f moments, and then turns into a heavy-fermion metal. In between, there may exist a delocalization quantum critical point responsible for the observed non-Fermi liquid region with linear-in- T resistivity. The insulator-to-metal transition is therefore a two-stage process. Superconductivity emerges in the heavy-fermion phase with well-nested Yb-4 f Fermi surfaces, suggesting that spin fluctuations may play a role in the Cooper pairing. NaYbSe 2 might therefore be the 3rd Yb-based heavy-fermion superconductor with a very “high” T c than most heavy-fermion superconductors." @default.
• W3188769791 created "2021-08-16" @default.
• W3188769791 creator A5026392938 @default.
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• W3188769791 date "2022-02-14" @default.
• W3188769791 modified "2023-10-17" @default.
• W3188769791 title "Mechanism of the insulator-to-metal transition and superconductivity in the spin liquid candidate NaYbSe2 under pressure" @default.
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• W3188769791 doi "https://doi.org/10.1038/s41535-022-00429-7" @default.
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