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- W2619784217 abstract "Although Fe-based superconductors are correlated electronic systems with multiorbital, previous nuclear magnetic resonance (NMR) measurement suggests that a single spin-fluid model is sufficient to describe its spin behavior. Here, we first observed the breakdown of single spin-fluid model in a heavily hole-doped Fe-based superconductor ${mathrm{CsFe}}_{2}{mathrm{As}}_{2}$ by site-selective NMR measurement. At high-temperature regime, both Knight shift and nuclear spin-lattice relaxation at $^{133}mathrm{Cs}$ and $^{75}mathrm{As}$ nuclei exhibit distinct temperature-dependent behavior, suggesting the breakdown of the single spin-fluid model in ${mathrm{CsFe}}_{2}{mathrm{As}}_{2}$. This is ascribed to the coexistence of both localized and itinerant spin degree of freedom at $3d$ orbitals, which is consistent with the orbital-selective Mott phase. With decreasing temperature, the single spin-fluid behavior is recovered below ${T}^{*}phantom{rule{4pt}{0ex}}ensuremath{sim}75$ K due to a coherent state among $3d$ orbitals. The Kondo liquid scenario is proposed to understand the low-temperature coherent state." @default.
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- W2619784217 date "2018-01-16" @default.
- W2619784217 modified "2023-10-14" @default.
- W2619784217 title "Breakdown of single spin-fluid model in the heavily hole-doped superconductor <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>CsFe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>" @default.
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- W2619784217 doi "https://doi.org/10.1103/physrevb.97.045118" @default.
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