The σ-phase superconductors Nb20.4Rh5.7Ge3.9 and Nb20.4Rh5.7Si3.9

Elizabeth M. Carnicom; Tai Kong; Tomasz Klimczuk; R.j. Cava

doi:10.1016/j.ssc.2018.09.014

The σ-phase superconductors Nb20.4Rh5.7Ge3.9 and Nb20.4Rh5.7Si3.9

Abstract

We show that the previously unreported ternary σ phases Nb20.4Rh5.7Ge3.9 and Nb20.4Rh5.7Si3.9 are both superconductors with Tc values of approximately 1.9 K. The superconducting transitions were characterized through temperature-dependent magnetic susceptibility, electrical resistance, and specific heat measurements. The Sommerfeld constants, γ, for Nb20.4Rh5.7Ge3.9 and Nb20.4Rh5.7Si3.9 are 89(1) mJ mol-f.u.−1K−2 and 86(1) mJ mol-f.u.−1K−2 (about 3.0 and 2.9 mJ mol-atom−1 K−2), respectively. The normalized specific heat jumps at Tc, ΔC/γTc, are approximately 1.39 for Nb20.4Rh5.7Ge3.9 and 1.30 for Nb20.4Rh5.7Si3.9, consistent with both materials being weakly coupled BCS type superconductors.

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Keywords

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Details

Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: SOLID STATE COMMUNICATIONS no. 284-286, pages 96 - 101,
ISSN: 0038-1098
Language:: English
Publication year:: 2018
Bibliographic description:: Carnicom E., Kong T., Klimczuk T., Cava R.: The σ-phase superconductors Nb20.4Rh5.7Ge3.9 and Nb20.4Rh5.7Si3.9// SOLID STATE COMMUNICATIONS. -Vol. 284-286, (2018), s.96-101
DOI:: Digital Object Identifier (open in new tab) 10.1016/j.ssc.2018.09.014
Verified by:: Gdańsk University of Technology