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arXiv 1406.3544cond-mat.supr-con
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超导体Ca PDMATHAAB Ir PDMATHAAC Sn $_{13}$的$^{119}$ Sn-NMR研究:多能隙超导性的证据

$^{119}$Sn-NMR investigations on superconducting Ca$_3$Ir$_4$Sn$_{13}$: Evidence for multigap superconductivity

R. Sarkar, F. Brückner, M. Günther, C. Petrovic, Kefeng Wang, P. K. Biswas, H. Luetkens, E. Morenzoni, A. Amato, H-H. Klauss

摘要:

利用$^{119}$ Sn核磁共振实验研究了Ca $_3$ Ir $_4$ Sn $_{13}$的体超导电性. BCS超导的自旋-晶格弛豫速率($1/T_1$)有两个经典特征,即$T_c$之下的Hebel-Slichter相干峰和超导相的指数衰减。$^{119}$ Sn Knight位移在低于$T_c$时的显著降低表明自旋单重态超导性。自旋晶格弛豫速率($1/T_1$)的温度依赖性令人信服地描述了多间隙各向同性超导带隙。目前的核磁共振实验没有看到任何迹象,增强自旋波动的正常状态。

英文摘要:

We report bulk superconductivity (SC) in Ca$_3$Ir$_4$Sn$_{13}$ by means of $^{119}$Sn nuclear magnetic resonance (NMR) experiments. Two classical signatures of BCS superconductivity in spin-lattice relaxation rate ($1/T_1$), namely the Hebel-Slichter coherence peak just below the $T_c$ and the exponential decay in the superconducting phase, are evident. The noticeable decrease of $^{119}$Sn Knight shift below $T_c$ indicates spin-singlet superconductivity. The temperature dependence of the spin-lattice relaxation rate ($1/T_1$) is convincingly described by the multigap isotropic superconducting gap. Present NMR experiments do not witness any sign of enhanced spin fluctuations in the normal state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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