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

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.

Authors:
; ; ; ; ; ; ; ORCiD logo
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES); Univ. of California, Riverside, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1566675
DOE Contract Number:  
SC0012670
Resource Type:
Journal Article
Journal Name:
Superconductor Science and Technology
Additional Journal Information:
Journal Volume: 31; Journal Issue: 12; Journal ID: ISSN 0953-2048
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
phonons, thermal conductivity, thermoelectric, spin dynamics, spintronics

Citation Formats

Zhao, G. J., Gong, X. X., Xu, P. C., Li, B. C., Huang, Z. Y., Jin, X. F., Zhu, X. D., and Chen, T. Y. Singlet superconductivity in a single-crystal NiBi 3 superconductor. United States: N. p., 2018. Web. doi:10.1088/1361-6668/aae4b4.
Zhao, G. J., Gong, X. X., Xu, P. C., Li, B. C., Huang, Z. Y., Jin, X. F., Zhu, X. D., & Chen, T. Y. Singlet superconductivity in a single-crystal NiBi 3 superconductor. United States. doi:10.1088/1361-6668/aae4b4.
Zhao, G. J., Gong, X. X., Xu, P. C., Li, B. C., Huang, Z. Y., Jin, X. F., Zhu, X. D., and Chen, T. Y. Fri . "Singlet superconductivity in a single-crystal NiBi 3 superconductor". United States. doi:10.1088/1361-6668/aae4b4.
@article{osti_1566675,
title = {Singlet superconductivity in a single-crystal NiBi 3 superconductor},
author = {Zhao, G. J. and Gong, X. X. and Xu, P. C. and Li, B. C. and Huang, Z. Y. and Jin, X. F. and Zhu, X. D. and Chen, T. Y.},
abstractNote = {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.},
doi = {10.1088/1361-6668/aae4b4},
journal = {Superconductor Science and Technology},
issn = {0953-2048},
number = 12,
volume = 31,
place = {United States},
year = {2018},
month = {10}
}

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