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Enhanced Superconducting Critical Parameters in a New High-Entropy Alloy Nb0.34Ti0.33Zr0.14Ta0.11Hf0.08.

ABSTRACT: The structural and physical properties of the new titanium- and niobium-rich type-A high-entropy alloy (HEA) superconductor Nb0.34Ti0.33Zr0.14Ta0.11Hf0.08 (in at.%) were studied by X-ray powder diffraction, energy dispersive X-ray spectroscopy, magnetization, electrical resistivity, and specific heat measurements. In addition, electronic structure calculations were performed using two complementary methods: the Korringa-Kohn-Rostoker Coherent Potential Approximation (KKR-CPA) and the Projector Augmented Wave (PAW) within Density Functional Theory (DFT). The results obtained indicate that the alloy exhibits type II superconductivity with a critical temperature close to 7.5 K, an intermediate electron-phonon coupling, and an upper critical field of 12.2(1) T. This finding indicates that Nb0.34Ti0.33Zr0.14Ta0.11Hf0.08 has one of the highest upper critical fields among all known HEA superconductors.

SUBMITTER: Idczak R 

PROVIDER: S-EPMC10489023 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature

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Enhanced Superconducting Critical Parameters in a New High-Entropy Alloy Nb<sub>0.34</sub>Ti<sub>0.33</sub>Zr<sub>0.14</sub>Ta<sub>0.11</sub>Hf<sub>0.08</sub>.

Idczak Rafał R   Nowak Wojciech W   Rusin Bartosz B   Topolnicki Rafał R   Ossowski Tomasz T   Babij Michał M   Pikul Adam A  

Materials (Basel, Switzerland) 20230824 17

The structural and physical properties of the new titanium- and niobium-rich type-A high-entropy alloy (HEA) superconductor Nb0.34Ti0.33Zr0.14Ta0.11Hf0.08 (in at.%) were studied by X-ray powder diffraction, energy dispersive X-ray spectroscopy, magnetization, electrical resistivity, and specific heat measurements. In addition, electronic structure calculations were performed using two complementary methods: the Korringa-Kohn-Rostoker Coherent Potential Approximation (KKR-CPA) and the Projector A  ...[more]

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