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Evolution of ground state and upper critical field in R(1-x)GdxNi2B2C (R = Lu, Y): Coexistence of superconductivity and spin-glass state

We report effects of local magnetic moment, Gd3+, doping (x =< 0.3) on superconducting and magnetic properties of the closely related Lu(1-x)GdxNi2B2C and Y(1-x)GdxNi2B2C 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.

preprint2010arXivOpen access
S. L. Bud&#39;koV. G. KoganH. HodovanetsS. RanS. A. MoserM. J. LampeP. C. Canfield
cond-mat.supr-con
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Open access7 authors1 topic
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S. L. Bud&#39;koV. G. KoganH. HodovanetsS. RanS. A. MoserM. J. LampeP. C. Canfield

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