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Specific heat and disorder in the mixed state of non-magnetic borocarbides

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Gladun,  A.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Cichorek,  T.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Gegenwart,  P.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Lipp, D., Schneider, M., Gladun, A., Drechsler, S. L., Freudenberger, J., Fuchs, G., et al. (2002). Specific heat and disorder in the mixed state of non-magnetic borocarbides. Europhysics Letters, 58(3), 435-441. doi:10.1209/epl/i2002-00392-7.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-3157-4
Abstract
The temperature and magnetic-field dependence of the specific heat c(p)(T, H) in the superconducting (sc) mixed state as well as the upper critical field H-c2(T) have been measured for polycrystalline YxLu1-xNi2B2C and Y(Ni(1-y)Pty)(2)B2C samples. The linear-in-T electronic specific-heat contribution gamma(H) . T exhibits significant deviations from the usual linear-in-H law resulting in a disorder-dependent negative curvature of gamma(H). The H-c2(T) data point to the quasi-clean limit for (Y, Lu)-substitutions and to a transition to the quasi-dirty limit for (Ni, Pt)-substitutions. The gamma(H)-dependence is discussed in the unitary d-wave as well as in the quasi-clean s-wave limits. From a consideration of gamma(H) data only, d- wave pairing cannot be ruled out.