Evolution of ground state and upper critical field in R1−xGdxNi2B2C (R=Lu,Y): Coexistence of superconductivity and spin-glass state
S. L. Bud’ko, V. G. Kogan, H. Hodovanets, S. Ran, S. A. Moser, M. J. Lampe, P. C. Canfield
DOI 10.1103/PhysRevB.82.174513 · Physical Review B
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Abstract
We report effects of local magnetic moment, Gd3+, doping (x≲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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16 | Pressure unresolved | onset |
| YNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15.5 | Pressure unresolved | onset |
| Lu1-xGdxNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | onset |
| Y1-xGdxNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | onset |
| Lu0.81Gd0.19Ni2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | onset |
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