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

References in corpus (5)

• A Review of the Properties of Nb3Sn and Their Variation with A15 Composition, Morphology and Strain State
• Superconductivity in the A15 Structure
• Superconductivity in a new hexagonal high entropy alloy
• Superconductivity in High-Entropy-Alloy Telluride AgInSnPbBiTe5
• Synthesis of high-entropy-alloy-type superconductors (Fe,Co,Ni,Rh,Ir)Zr2 with tunable transition temperature

Cited by in corpus (2)

• Superconductivity with large upper critical field in noncentrosymmetric Cr-bearing high-entropy alloys
• Estimation of Grüneisen parameter of high-entropy-alloy-type functional materials