Singlet superconductivity in a single-crystal NiBi3 superconductor

G. J. Zhao, X. X. Gong, P. C. Xu, B. C. Li, Z. Y. Huang, X. F. Jin, X. D. Zhu, Tingyong Chen

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

Andreev reflection spectroscopy with unpolarized and highly spin-polarized currents has been utilized to study an intermetallic single-crystal superconductor NiBi3. Magnetoresistance at zero bias voltage of point contacts shows the occurrence and suppression of Andreev reflection by unpolarized and polarized current, respectively. The gap value, its symmetry and temperature dependence have been determined using an unpolarized current. The spin state in the NiBi3 sample is determined to be antiparallel using a highly spin-polarized current. The gap value 2Δ/k B T, gap symmetry and its temperature dependence, combined with the antiparallel spin state show that the bulk NiBi3 is a singlet s-wave superconductor.

Original languageEnglish (US)
Article number125005
JournalSuperconductor Science and Technology
Volume31
Issue number12
DOIs
StatePublished - Oct 26 2018

Keywords

  • Andreev reflection
  • ferromagnetic superconductors
  • superconducting order parameter
  • triplet and singlet superconductivity

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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    Zhao, G. J., Gong, X. X., Xu, P. C., Li, B. C., Huang, Z. Y., Jin, X. F., Zhu, X. D., & Chen, T. (2018). Singlet superconductivity in a single-crystal NiBi3 superconductor. Superconductor Science and Technology, 31(12), [125005]. https://doi.org/10.1088/1361-6668/aae4b4