Microscopic characterization of the superconducting gap function in Sn_(1-x)In_xTe

T. Nomoto; M. Kawamura; T. Koretsune; R. Arita; T. Machida; T. Hanaguri; M. Kriener; Y. Taguchi; Y. Tokura

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Microscopic characterization of the superconducting gap function in Sn_(1-x)In_xTe

机译：Sn_（1-x）In_xTe中超导间隙函数的微观表征

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Superconductivity in the doped topological crystalline insulator Sn_(1-x)In_xTe is studied by first-principles calculation based on superconducting density functional theory (SCDFT) and tunneling spectroscopy. By considering the spin-orbit coupling and frequency dependence of the screened Coulomb interaction in SCDFT, we succeed in reproducing the critical temperature of Sn_(1-x)In_xTe quantitatively, in which the spin-orbit coupling is found to play an essential role. The leading gap function is a conventional 5 wave with moderate anisotropy in k space, and we find that the subdominant odd-parity instability is significantly weaker than the s-wave instability. We perform tunneling spectroscopy measurement and confirm that the spectrum is consistent with the calculated gap function.

机译：基于超导密度泛函理论（SCDFT）和隧穿光谱，通过第一性原理计算，研究了掺杂的拓扑晶体绝缘子Sn_（1-x）In_xTe中的超导性。通过考虑自旋轨道耦合和SCDFT中筛选的库仑相互作用的频率依赖性，我们成功地定量再现了Sn_（1-x）In_xTe的临界温度，其中发现自旋轨道耦合起着至关重要的作用。前导间隙函数是在k空间中具有中等各向异性的常规5波，我们发现次奇奇偶不稳定性明显弱于s波不稳定性。我们执行隧道光谱测量，并确认光谱与计算的间隙函数一致。

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来源
《Physical review》 |2020年第1期|014505.1-014505.8|共8页
作者
T. Nomoto; M. Kawamura; T. Koretsune; R. Arita; T. Machida; T. Hanaguri; M. Kriener; Y. Taguchi; Y. Tokura;
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Department of Applied Physics The University of Tokyo Hongo Bunkyo-ku Tokyo 113-8656 Japan;

The Institute for Solid State Physics The University of Tokyo Kashiwa-shi Chiba 277-8581 Japan;

Department of Physics Tohoku University Miyagi 980-8578 Japan;

Department of Applied Physics The University of Tokyo Hongo Bunkyo-ku Tokyo 113-8656 Japan RIKEN Center for Emergent Matter Science (CEMS) Wako 351-0198 Japan;

RIKEN Center for Emergent Matter Science (CEMS) Wako 351-0198 Japan;

Department of Applied Physics The University of Tokyo Hongo Bunkyo-ku Tokyo 113-8656 Japan RIKEN Center for Emergent Matter Science (CEMS) Wako 351-0198 Japan Tokyo College The University of Tokyo Hongo Bunkyo-ku Tokyo 113-8656 Japan;

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Microscopic characterization of the superconducting gap function in Sn_(1-x)In_xTe

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