Singlet superconductivity in a single-crystal NiBi 3 superconductor

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

doi:10.1088/1361-6668/aae4b4

Title: Singlet superconductivity in a single-crystal NiBi ₃ superconductor

Journal Article · Fri Oct 26 00:00:00 EDT 2018 · Superconductor Science and Technology

DOI:https://doi.org/10.1088/1361-6668/aae4b4· OSTI ID:1566675

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

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.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES); Univ. of California, Riverside, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

DOE Contract Number:: SC0012670

OSTI ID:: 1566675

Journal Information:: Superconductor Science and Technology, Vol. 31, Issue 12; ISSN 0953-2048

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

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