Evolution of ground state and upper critical field in R1-xGdxNi2B2C (R = Lu, Y): Coexistence of superconductivity and spin-glass state

Article

关键词: MAGNETIC BOROCARBIDE SUPERCONDUCTORS;    ANISOTROPIC SUPERCONDUCTORS;    WAVE SUPERCONDUCTIVITY;    PAIR-BREAKING;    IMPURITIES;    YNI2B2C;    TEMPERATURE;    LUNI2B2C;    HEAT;    TRANSITIONS;   

DOI  :  10.1103/PhysRevB.82.174513

来源: SCIE

【 摘 要 】

We report effects of local magnetic moment, Gd3+, doping (x less than or similar to 0.3) on superconducting and magnetic properties of the closely related Lu1-xGdxNi2B2C and Y1-xGdxNi2B2C series. The superconducting transition temperature decreases and the heat capacity jump associated with it drops rapidly with Gd doping; qualitative changes with doping are also observed in the temperature-dependent upper critical field behavior, and a region of coexistence of superconductivity and spin-glass state is delineated on the x-T phase diagram. The evolution of superconducting properties can be understood within Abrikosov-Gor'kov theory of magnetic impurities in superconductors taking into account the paramagnetic effect on upper critical field with additional contributions particular for the family under study.

【 授权许可】

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