Superconductivity in the amorphous phase of topological insulator Bix Sb100–x
alloys

Barzola-Quiquia, J .; Lauinger, C.; Zoraghi, Mahsa; Stiller, M.; Sharma, S.; Häussler, P.

doi:10.1088/0953-2048/30/1/015013

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Superconductivity in the amorphous phase of topological insulator Bi_x Sb_100–xalloys

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Barzola-Quiquia, J.., Lauinger, C., Zoraghi, M., Stiller, M., Sharma, S., & Häussler, P. (2016). Superconductivity in the amorphous phase of topological insulator Bi_x Sb_100–xalloys. Superconductor Science and Technology, 30: 015013. doi:10.1088/0953-2048/30/1/015013.

Cite as: https://hdl.handle.net/21.11116/0000-0002-F20E-E

Abstract

In this work we investigated the electrical properties of rapidly quenched amorphous Bi x Sb${}_{100-x}$ alloys in the temperature range of 1.2 K to 345 K. The resistance reveals that for a broad range of different compositions, including that for the topological insulator (TI), a superconducting state in the amorphous phase is present. After crystallization and annealing at an intermediate temperature, we found that in pure Bi and Bi x Sb${}_{100-x}$ alloys with composition corresponding to the TI, the superconductivity persists, but the transition shifts to a lower temperature. The highest superconducting transition temperature ${T}_{{\rm{C}}0}$ was found for pure Bi and those TI's, with a shift to low temperatures when the Sb content is increased. After annealing at a maximum temperature of T = 345 K, the samples are non-superconducting within the experimental range and the behavior changes from semiconducting-like for pure Bi, to metallic-like for pure Sb. Transition temperature ${T}_{{\rm{C}}0}$ of the amorphous Bi x Sb${}_{100-x}$ alloys have been calculated in the BCS–Eliashberg–McMillan framework, modified for binary alloys. The results can explain the experimental results and show that amorphous Bi x Sb${}_{100-x}$ exhibits a strong to intermediate electron–phonon coupling.