Superconductivity of Ta34Nb33Hf8Zr14Ti11 high entropy alloy from first principles calculations

The Korringa-Kohn-Rostoker method with the coherent potental approximation (KKR-CPA) is applied to study the first superconducting high entropy alloy (HEA) Ta34Nb33Hf8Zr14Ti11 (discovered in 2014 with Tc = 7.3 K), focusing on estimations of the electron-phonon coupling constant \lambda. Electronic p...

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Bibliographic Details
Published in:arXiv.org 2016-03
Main Authors: Jasiewicz, K, Wiendlocha, B, Korbeń, P, Kaprzyk, S, Tobola, J
Format: Article
Language:English
Subjects:
Approximation
Atomic properties
Coupling
First principles
High entropy alloys
Mathematical analysis
Phonons
Specific heat
Superconductivity
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Summary:The Korringa-Kohn-Rostoker method with the coherent potental approximation (KKR-CPA) is applied to study the first superconducting high entropy alloy (HEA) Ta34Nb33Hf8Zr14Ti11 (discovered in 2014 with Tc = 7.3 K), focusing on estimations of the electron-phonon coupling constant \lambda. Electronic part of \lambda has been calculated using the rigid muffin-tin approximation (RMTA), while the phonon part has been approximated using average atomic mass and experimental Debye temperature. The estimated \lambda = 1.16 is close to the value determined from specific heat measurements, \lambda = 0.98, and suggests rather strong electron-phonon coupling in this material.
ISSN:2331-8422
DOI:10.48550/arxiv.1603.07274