Superconductivity in the superhard boride WB4.2

We show that the superhard boride WB4.2 is a superconductor with a Tc of 2.05(5) K. Temperature-dependent magnetic susceptibility, electrical resistivity, and specific heat measurements were used to characterize the superconducting transition. The Sommerfeld constant γ for WB4.2 is 2.07(3) mJ mol−1...

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Bibliographic Details
Published in:Superconductor science & technology 2018-09, Vol.31 (11)
Main Authors: Carnicom, Elizabeth M, Strychalska-Nowak, Judyta, Wi niewski, P, Kaczorowski, D, Xie, W, Klimczuk, T, Cava, R J
Format: Article
Language:English
Subjects:
boride
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
superconductivity
superhard
tungsten deficient
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Summary:We show that the superhard boride WB4.2 is a superconductor with a Tc of 2.05(5) K. Temperature-dependent magnetic susceptibility, electrical resistivity, and specific heat measurements were used to characterize the superconducting transition. The Sommerfeld constant γ for WB4.2 is 2.07(3) mJ mol−1 K−2 and the ΔC/γTc = 1.56, which is somewhat higher than what is expected for weakly coupled Bardeen-Cooper-Schrieffer type superconductors. The Hc2 versus T plot is linear over a wide temperature range but does show signs of flattening by the lowest temperatures studied and therefore the zero temperature upper critical field ( 0Hc2(0)) for WB4.2 lies somewhere between the linear extrapolation of 0Hc2(T) to 0 K and expectations based on the Werthamer-Helfand-Hohenberg model.
ISSN:0953-2048
1361-6668
DOI:10.1088/1361-6668/aade5a