标题： 非中心对称TaIr$_2$B$_2$中的单能隙两带超导性远高于泡利极限 显示英文标题

标题： Single-gap two-band superconductivity well above the Pauli limit in non-centrosymmetric TaIr$_2$B$_2$

摘要： 非中心对称超导材料代表了一类具有多种非常规特性的新型超导体，其中包括混合宇称配对和极高的上临界磁场。 在这里，我们利用一系列互补的实验方法（包括体敏感和表面敏感技术）对TaIr$_2$B$_2$（$T_c$= 5.1 K）进行了全面研究。 我们提供的证据表明，该体系是双带的，但表现得像一个强耦合的单能隙超导体。 TaIr$_2$B$_2$的上临界磁场显著超过了泡利极限，并且在最低温度下表现出几乎线性的温度依赖性。 这种在超导体中很少见的行为，被讨论为反称自旋轨道相互作用、双带效应以及强耦合效应和无序共同作用的结果。 显示英文摘要

摘要： Non-centrosymmetric superconducting materials represent an exciting class of novel superconductors featuring a variety of unconventional properties, including mixed-parity pairing and very high upper critical fields. Here, we present a comprehensive study of TaIr$_2$B$_2$ (with $T_c$ = 5.1 K), using a set of complementary experimental methods, including bulk- and surface-sensitive techniques. We provide evidence that this system is a two-band, yet it behaves as a single-gap superconductor with a strong coupling. The upper critical field of TaIr$_2$B$_2$ significantly exceeds the Pauli limit and exhibits a nearly linear temperature dependence down to the lowest temperatures. This behavior, rarely seen in superconductors, is discussed in terms of anti-symmetric spin-orbit interaction, two-band-, and strong-coupling effects, as well as disorder.