Synthesis of new high-entropy alloy-type Nb3 (Al, Sn, Ge, Ga, Si) superconductors

Abstract

Studies on high-entropy alloy (HEA) superconductors have recently been increasing, particularly in the fields of materials science and condensed matter physics. To contribute to research on new HEA-type superconductors, in our study we synthesized polycrystalline samples of A15-type superconductors of Nb3Al0.2Sn0.2Ge0.2Ga0.2Si0.2 (#1) and Nb3Al0.3Sn0.3Ge0.2Ga0.1Si0.1 (#2) with an HEA-type site by arc melting. Elemental and structural analyses revealed that the compositions of the obtained samples satisfied the HEA state criteria. Superconducting transitions were observed at 9.0 and 11.0 K for #1 and #2, respectively, in the temperature dependence of magnetization and electrical resistivity. Specific heat measurements revealed that the Sommerfeld coefficient, Debye temperature, and ΔC/γTc for the obtained samples were close to those reported for conventional Nb3Sn family superconductors.

15 pages, 4 figures, 1 table

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• Superconductivity in High-Entropy-Alloy Telluride AgInSnPbBiTe5
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Cited by in corpus (7)

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• Anomalous broadening of specific heat jump at Tc in high-entropy-alloy-type superconductor TrZr2
• Quantifying nonadiabaticity in major families of superconductors
• Improvement of local critical current density of REBa2Cu3O7-d by the increase in configurational entropy of mixing at the RE site
• Tuning of Carrier Concentration and Superconductivity in High-Entropy-Alloy-Type Metal Telluride (AgSnPbBi)(1-x)/4InxTe
• Local distortions of the crystal structure and their influence on the electronic structure and superconductivity of the high-entropy alloy (TaNb)0.67(HfZrTi)0.33
• Estimation of Grüneisen parameter of high-entropy-alloy-type functional materials