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We report the crystal structure and superconducting properties of new V 5+2 x  Nb 35− x  Mo 35− x  Ir 10 Pt 15  high-entropy alloys (HEAs) for  x  in the range of 0    ≤    x    ≤    10. These HEAs are found to crystallize in a cubic A15-type structure and have a weakly coupled, fully gapped superconducting state. A maximum  T  c  of 5.18 K and zero-temperature upper critical fieldB   c  2(0) of 6.4 T are observed at  x  = 0, and both quantities decrease monotonically with the increase of V content  x . In addition,  T  c  shows an increase with increasing valence electron concentration from 6.4 to 6.5, which is compared with other A15-type HEA and binary superconductors.

Superconductivity in Cubic A15-type V–Nb–Mo–Ir–Pt High-Entropy Alloys