Two-dimensional superconductivity with exotic magnetotransports in conventional superconductor BiIn2

Zhujialei Lei, Zu Yin Deng,I Nan Chen, Chin Wei Lin, Chiu Hsien Wu, En Pei Liu,Wei Tin Chen,Li Min Wang

Materials Today Physics(2024)

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摘要
This paper presents pronounced two-dimensional (2D) superconductivity, exotic magnetotransport properties, as well as band structure calculations of BiIn2, showing a pronounced exotic topological nature. The 2D nature driven by the surface superconductivity with the transition temperature Tc of 5.56 K for the polycrystalline BiIn2 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 BiIn2 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 BiIn2 is dominated by the surface electrons in topological Dirac-cone-like states. Finally, all the findings are summarized in a constructed phase diagram of BiIn2 in the H-T plane, displaying different regimes of transport. Thus, this work reveals that the combination of 2D superconductivity and Dirac-like surface states of BiIn2 drastically impacts the possible topological superconductivity in conventional superconductor BiIn2.
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