Strong-coupling Spin-singlet Superconductivity with Multiple Full Gaps in Hole-doped Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$ Probed by Fe-NMR
作者： Y. Kitaoka , H. Nishimura , H. Kito , K. Kiho , H. Mukuda
关键词:
摘要: We present $^{57}$Fe-NMR measurements of the novel normal and superconducting-state characteristics iron-arsenide superconductor Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$ ($T_c$ = 38 K). In state, measured Knight shift nuclear spin-lattice relaxation rate $(1/T_1)$ demonstrate development wave-number ($q$)-dependent spin fluctuations, except at $q$ 0, which may originate from nesting across disconnected Fermi surfaces. superconducting component in $^{57}$Fe-Knight decreases to almost zero low temperatures, evidencing a spin-singlet state. The $^{57}$Fe-$1/T_1$ results are totally consistent with $s^\pm$-wave model multiple full gaps, regardless doping either electrons or holes.
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sci-hub.st 参考文章(32)
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