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Two-dimensional superconductivity with exotic magnetotransports in conventional superconductor BiIn2
Materials Today Physics ( IF 10.0 ) Pub Date : 2024-07-09 , DOI: 10.1016/j.mtphys.2024.101505
Zhujialei Lei , Zu Yin Deng , I Nan Chen , Chin Wei Lin , Chiu Hsien Wu , En Pei Liu , Wei Tin Chen , Li Min Wang

This paper presents pronounced two-dimensional (2D) superconductivity, exotic magnetotransport properties, as well as band structure calculations of BiIn, showing a pronounced exotic topological nature. The 2D nature driven by the surface superconductivity with the transition temperature of 5.56 K for the polycrystalline BiIn samples was verified by a Berezinsky-Kosterlitz-Thouless transition and transport vortex dynamics was interpreted in terms of thermally-assisted flux motion in two dimensions. The normal-state magnetoresistance (MR) of BiIn at low temperatures could be described by the weak-antilocalization transport formula, which is commonly observed on topological materials. Moreover, the high-field transverse MR at temperatures below 40 K showed a non-saturating, linear-like behavior that was examined using the theory of Abrikosov's quantum MR. These results strongly support the scenario that the normal-state magnetotransport in BiIn is dominated by the surface electrons in topological Dirac-cone-like states. Finally, all the findings are summarized in a constructed phase diagram of BiIn in the - plane, displaying different regimes of transport. Thus, this work reveals that the combination of 2D superconductivity and Dirac-like surface states of BiIn drastically impacts the possible topological superconductivity in conventional superconductor BiIn.

中文翻译:


传统超导体 BiIn2 中具有奇异磁输运的二维超导性



本文介绍了 BiIn 明显的二维 (2D) 超导性、奇异的磁输运特性以及能带结构计算,显示出明显的奇异拓扑性质。多晶 BiIn 样品的转变温度为 5.56 K 的表面超导性驱动的二维性质通过 Berezinsky-Kosterlitz-Thouless 转变得到验证,输运涡动力学则根据二维热辅助通量运动进行解释。 BiIn在低温下的常态磁阻(MR)可以用拓扑材料中常见的弱反局域化输运公式来描述。此外,在低于 40 K 的温度下,高场横向 MR 表现出非饱和的类线性行为,这一点可以使用 Abrikosov 的量子 MR 理论进行检验。这些结果有力地支持了 BiIn 中的正常态磁输运由拓扑狄拉克锥态的表面电子主导的情况。最后,所有的发现都总结在 BiIn 在平面上构建的相图中,显示了不同的传输方式。因此,这项工作揭示了 BiIn 的二维超导性和类狄拉克表面态的结合极大地影响了传统超导体 BiIn 中可能的拓扑超导性。
更新日期:2024-07-09
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