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

Author(s): Carnicom, Elizabeth M; Kong, Tai; Klimczuk, Tomasz; Cava, Robert J

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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.
Publication Date: 20-Sep-2018
Citation: Carnicom, Elizabeth M, Kong, Tai, Klimczuk, Tomasz, Cava, RJ. (2018). The σ-phase superconductors Nb20.4Rh5.7Ge3.9 and Nb20.4Rh5.7Si3.9. Solid State Communications, 284-286 (96 - 101. doi:10.1016/j.ssc.2018.09.014
DOI: doi:10.1016/j.ssc.2018.09.014
ISSN: 0038-1098
Pages: 96 - 101
Language: en
Type of Material: Journal Article
Journal/Proceeding Title: Solid State Communications
Version: Author's manuscript



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