Single-gap two-band superconductivity well above the Pauli limit in non-centrosymmetric TaIr2B2

IF 5.6 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

Superconductivity Pub Date : 2025-04-03 DOI:10.1016/j.supcon.2025.100167

J. Kačmarčík , Z. Pribulová , T. Shiroka , F. Košuth , P. Szabó , M.J. Winiarski , S. Królak , J. Jaroszynski , T. Shang , R.J. Cava , C. Marcenat , T. Klein , T. Klimczuk , P. Samuely

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引用次数: 0

Abstract

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}

_{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}

_{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.

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在非中心对称的TaIr2B2中，单间隙双带超导性远高于泡利极限

非中心对称超导材料代表了一类令人兴奋的新型超导体，具有各种非常规的特性，包括混合宇称配对和非常高的上临界场。在这里，我们使用一组互补的实验方法，包括体敏和表面敏技术，对TaIr2B2 （Tc=5.1 K）进行了全面的研究。我们提供的证据表明，该系统是一个两波段，但它表现为具有强耦合的单间隙超导体。TaIr2B2的上临界场明显超过泡利极限，并表现出近线性的温度依赖性，直至最低温度。这种在超导体中很少见到的行为，从反对称自旋轨道相互作用、双带和强耦合效应以及无序的角度进行了讨论。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Superconductivity

CiteScore

3.90

自引率

0.00%

发文量