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- W1567172709 abstract "We report $^{75}text{A}text{s}$ nuclear quadrupole resonance studies on superconducting oxypnictide ${text{LaFeAsO}}_{0.92}{text{F}}_{0.08}$ $({T}_{c}=23text{ }text{K})$. The temperature dependence of the spin-lattice relaxation rate $(1/{T}_{1})$ decreases below ${T}_{c}$ without a coherence (Hebel-Slichter) peak and shows a temperature dependence that is not simple power law nor exponential. We show that the result can be understood in terms of two superconducting gaps of either $d$- or $ifmmodepmelsetextpmfi{}s$-wave symmetry, with the larger gap ${ensuremath{Delta}}_{1}ensuremath{sim}4{k}_{B}{T}_{c}$ and the smaller one ${ensuremath{Delta}}_{2}ensuremath{sim}1.5{k}_{B}{T}_{c}$. Our result suggests that the multiple-gap feature is universal in the oxypnictide superconductors, which is probably associated with the multiple electronic band structures in this class of materials. We also find that $1/{T}_{1}T$ above ${T}_{c}$ increases with decreasing temperature, which suggests weak magnetic fluctuations in the normal state." @default.
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- W1567172709 date "2008-12-18" @default.
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- W1567172709 title "Two superconducting gaps in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mtext>LaFeAsO</mml:mtext></mml:mrow><mml:mrow><mml:mn>0.92</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mtext>F</mml:mtext><mml:mrow><mml:mn>0.08</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>revealed by<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mmultiscripts><mml:mtext>A</mml:mtext><mml:mprescripts /><mml:…" @default.
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- W1567172709 doi "https://doi.org/10.1103/physrevb.78.220506" @default.
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