Abstract
We report the effects of variation of the CeRu stoichiometry and substitutions of Co for Ru and Nd for Ce in polycrystalline samples of the type II superconductor CeRu 2. A magnetic study of the normal and superconducting state properties of these compounds was made, including the ‘peak effect’ (PE) enhancement of the critical current density J c that occurs between a field H i and the upper critical field H c2 in the superconducting mixed state. The width of the PE region ( H c2 − H i)/ H c2 as well as the magnitude of the pinning are correlated with the supeconduting critical temperature in the substituted alloys, but are not sensitive to material parameters such as the electronic mean free path. These results suggest that the PE in CeRu 2 is of conventional origin, instead of arising from an exotic mixed state such as the spatially nonuniform Fulde-Ferrell-Larkin-Ovchinnikov state. The superconducting H T phase diagrams for the alloys in the substitution study are also presented.
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