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

TitleEvolution of ground state and upper critical field in R1-xGdxNi2B2C (R = Lu, Y): Coexistence of superconductivity and spin-glass state
Publication TypeJournal Article
Year of Publication2010
AuthorsBud'ko SL, Kogan VG, Hodovanets H, Ran S, Moser SA, Lampe MJ, Canfield PC
Journal TitlePhysical Review B
Volume82
Pages174513
Date Published11/17
ISBN Number1098-0121
Accession NumberISI:000284305800008
Keywordsanisotropic superconductors, heat, impurities, LUNI2B2C, magnetic borocarbide superconductors, pair-breaking, temperature, TRANSITIONS, wave superconductivity, yni2b2c
Abstract

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.
URL<Go to ISI>://000284305800008http://prb.aps.org/pdf/PRB/v82/i17/e174513
DOI10.1103/Physrevb.82.174513
Alternate JournalPhys Rev B