Superconducting Ti15Zr15Nb35Ta35 High-Entropy Alloy With Intermediate Electron-Phonon Coupling

Yuan Yuan; Yuan Wu; Huiqian Luo; Huiqian Luo; Zhaosheng Wang; Xue Liang; Zhi Yang; Hui Wang; Xiongjun Liu; Zhaoping Lu

doi:10.3389/fmats.2018.00072

Frontiers in Materials (Nov 2018)

Superconducting Ti15Zr15Nb35Ta35 High-Entropy Alloy With Intermediate Electron-Phonon Coupling

Yuan Yuan,
Yuan Wu,
Huiqian Luo,
Huiqian Luo,
Zhaosheng Wang,
Xue Liang,
Zhi Yang,
Hui Wang,
Xiongjun Liu,
Zhaoping Lu

Affiliations

Yuan Yuan: State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, China
Yuan Wu: State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, China
Huiqian Luo: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China
Huiqian Luo: Songshan Lake Materials Laboratory, Dongguan, China
Zhaosheng Wang: High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei, Anhui, China
Xue Liang: Laboratory for Microstructures, Institute of Materials, Shanghai University, Shanghai, China
Zhi Yang: State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, China
Hui Wang: State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, China
Xiongjun Liu: State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, China
Zhaoping Lu: State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, China

DOI: https://doi.org/10.3389/fmats.2018.00072
Journal volume & issue: Vol. 5

Abstract

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The body-centered cubic (BCC) Ti15Zr15Nb35Ta35 high-entropy alloy showed superconducting behavior at around 8 K. The electronic specific heat coefficient γ and the lattice specific heat coefficient β were determined to be γ = 9.3 ± 0.1 mJ/mol K2 and β = 0.28 ± 0.01 mJ/mol K4, respectively. It was found that the electronic specific heat Ces does follow the exponential behavior of the Bardeen-Cooper-Schrieffer (BCS) theory. Nevertheless, the specific heat jump (ΔC/γTc) at the superconducting transition temperature which was determined to be 1.71 deviates appreciably from that for a weak electron-phonon coupling BCS superconductor. Within the framework of the strong-coupled theory, our analysis suggests that theTi15Zr15Nb35Ta35 HEA is an intermediate electron-phonon coupled BCS-type superconductor.

Published in Frontiers in Materials

ISSN: 2296-8016 (Online)
Publisher: Frontiers Media S.A.
Country of publisher: Switzerland
LCC subjects: Technology
Website: https://www.frontiersin.org/journals/materials

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