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Superconductivity in the amorphous phase of topological insulator Bix Sb100–xalloys

Barzola-Quiquia, J.., Lauinger, C., Zoraghi, M., Stiller, M., Sharma, S., & Häussler, P. (2016). Superconductivity in the amorphous phase of topological insulator Bix Sb100–xalloys. Superconductor Science and Technology, 30: 015013. doi:10.1088/0953-2048/30/1/015013.

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Barzola-Quiquia, J .1, Author
Lauinger, C.1, Author
Zoraghi, Mahsa1, Author
Stiller, M.1, Author
Sharma, S.1, Author
Häussler, P.1, Author
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1External Organizations, ou_persistent22

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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.

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Language(s): eng - English
Dates: 2016-06-022016-09-292016-11-15
Publication Status: Published online
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Rev. Type: Peer
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Title: Superconductor Science and Technology
Source Genre: Journal
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Publ. Info: Bristol : IOP Pub.
Pages: - Volume / Issue: 30 Sequence Number: 015013 Start / End Page: - Identifier: ISSN: 0953-2048
CoNE: https://pure.mpg.de/cone/journals/resource/954925575984