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arXiv 1404.2154cond-mat.supr-con
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局部非中心对称SrPtAs中的自旋单重态全带隙超导性

Spin-singlet superconductivity with a full gap in locally non-centrosymmetric SrPtAs

K. Matano, K. Arima, S. Maeda, Y. Nishikubo, K. Kudo, M. Nohara, Guo-qing Zheng

摘要:

我们报告了局部非中心对称超导体SrPtAs的$^{195}$ Pt-NMR和$^{75}$ As-NQR测量结果,其中As-Pt层破坏了反转对称性,而整体化合物是中心对称的。核自旋晶格弛豫速率$1/T_1$在低于$T_c$处显示出明确的相干峰,并且在低温下呈指数下降。由奈特位移测量的自旋磁化率也从$T_c$下降到$T<T_c/6$。这些数据连同从NMR谱获得的穿透深度可以一致地通过假设具有全带隙的自旋单重态超导态来解释。我们的结果表明,局域反转破缺引起的自旋-轨道耦合不足以产生奇异超导态,或者层间跳跃相互作用大于自旋-轨道耦合.

英文摘要:

We report $^{195}$Pt-NMR and $^{75}$As-NQR measurements for the locally non-centrosymmetric superconductor SrPtAs where the As-Pt layer breaks inversion symmetry while globally the compound is centrosymmetric. The nuclear spin lattice relaxation rate $1/T_1$ shows a well-defined coherence peak below $T_c$ and decreases exponentially at low temperatures. The spin susceptibility measured by the Knight shift also decreases below $T_c$ down to $T<T_c/6$. These data together with the penetration depth obtained from the NMR spectra can be consistently explained by assuming a spin-singlet superconducting state with a full gap. Our results suggest that the spin-orbit coupling due to the local inversion-breaking is not large enough to bring about an exotic superconducting state, or the inter-layer hopping interaction is larger than the spin-orbit coupling.

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