高熵合金型超导体TrZr2中T_c处specific heat跃迁的反常展宽
Anomalous broadening of specific heat jump at Tc in high-entropy-alloy-type superconductor TrZr2
摘要：
高熵合金型（HEA型）超导体是一类新的高度无序超导体。因此，在HEA型超导体中发现全新的超导特性将为研究结构无序与超导电性的关系开辟新的途径。本文报道了在不同混合熵（ΔSmix）下，过渡金属锆化物（TrZr 2）在超导转变温度（Tc）附近比热跃变的显著展宽.随着ΔSmix的增加，比热中看到的超导转变变得更宽，而磁化中看到的超导转变通常是尖锐的。因此，比热跃变的加宽可能与体超导态出现后库珀对形成的微观不均匀性有关。
英文摘要：
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.
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