This article has an erratum: [erratum]
Volume 58, Number 3, May 2002
|Page(s)||435 - 441|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 August 2002|
Specific heat and disorder in the mixed state of non-magnetic borocarbides
Institut für Halbleiter- und Mikrosystemtechnik
Technische Universität (TU) Dresden -
D-01062 Dresden, Germany
2 Institut für Tieftemperaturphysik, TU Dresden - D-01062 Dresden, Germany
3 Institut für Festkörper- und Werkstofforschung e.V. D-01171 Dresden, Postfach 270116, Germany
4 Max-Planck-Institut für Chemische Physik fester Stoffe - D-01187 Dresden, Germany
Corresponding author: firstname.lastname@example.org
Accepted: 11 February 2002
The temperature and magnetic-field dependence of the specific heat in the superconducting (sc) mixed state as well as the upper critical field have been measured for polycrystalline x and ( y)2 samples. The linear-in-T electronic specific-heat contribution exhibits significant deviations from the usual linear-in-H law resulting in a disorder-dependent negative curvature of . The data point to the quasi-clean limit for -substitutions and to a transition to the quasi-dirty limit for -substitutions. The -dependence is discussed in the unitary d-wave as well as in the quasi-clean s-wave limits. From a consideration of data only, d-wave pairing cannot be ruled out.
PACS: 74.70.Dd – Ternary, quaternary and multinary compounds (including Chevrel phases, borocarbides etc.) / 74.62.Dh – Effects of crystal defects, doping, and substitution / 74.25.Bt – Thermodynamic properties
© EDP Sciences, 2002
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