Reentrant Superconductivity of CeRu_2

概要

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Magnetization curves [MC] and temperature dependence of the AC susceptibility [TS] were measured in the superconducting phase of CeRu_2 with T_c=6.55 K in zero field. For fields higher than 0.8 T in [TS], the superconducting susceptibility behaves normally up to the lowest transition temperature T_<cL> where it decreases suddenly ; the field-induced reentrant superconductivity occurs at T_<cL> and breaks very sharply to the normal state at T_<cH> (the highest transition temperature). In [MC], an anomaly appears when the magnetization reaches to the extrapolated magnetization of the normal state at H_R (reentrant field). Magnetization drops suddenly to negative in the field-increasing process for temperatures below 3.9 K, and it only increases for temperatures above 4.0 K. Reentrant superconductivity occurs between, H_R and H_<c2>. The reentrant phase has positive magnetization in the background.
社団法人日本物理学会の論文
1993-11-15