Anomalous broadening of specific heat jump at Tc in high-entropy-alloy-type superconductor TrZr2

Abstract

A high-entropy-alloy-type (HEA-type) superconductor is new category of highly disordered superconductors. Therefore, finding brand-new superconducting characteristics in the HEA-type superconductors would open new avenue to investigate the relationship between structural disorder and superconductivity. Here, we report on the remarkable broadening of specific heat jump near a superconducting transition tempreature (Tc) in transition-metal zirconides (TrZr2) with different mixing entropy (ΔSmix) at the Tr site. With increasing ΔSmix, the superconducting transition seen in specific heat became broader, whereas those seen in magnetization were commonly sharp. Therefore the broadening of specific heat jump would be related to the microscopic inhomogeneity of the formation of Cooper pairs behind the emergence of bulk superconductivity states.

7 pages, 3 figures

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Cited by in corpus (6)

• Boron based new high entropy alloy superconductor Mo0.11W0.11V0.11Re0.34B0.33
• Superconductivity of high-entropy-alloy-type transition-metal zirconide (Fe,Co,Ni,Cu,Ga)Zr2
• 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
• Specific heat analyses on optical-phonon-derived uniaxial negative thermal expansion system $Tr$Zr${}_2$ ($Tr$ = Fe and Co${}_{1-x}$Ni${}_x$)
• Pressure-induced volumetric negative thermal expansion in CoZr2 superconductor
• Superconducting properties and electronic structure of CuAl2-type transition-metal zirconide Fe1-xNixZr2