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

D. Lipp; M. Schneider; A. Gladun; S.-L. Drechsler; J. Freudenberger; G. Fuchs; K. Nenkov; K.-H. Mülcer; T. Cichorek; P. Gegenwart

doi:10.1209/epl/i2002-00392-7

All issues

Volume 58 / No 3 (May 2002)

Europhys. Lett., 58 3 (2002) 435-441

Abstract

This article has an erratum: [https://doi.org/10.1209/epl/i2002-00106-9]

Issue		Europhys. Lett. Volume 58, Number 3, May 2002


Page(s)		435 - 441
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2002-00392-7
Published online		01 August 2002

Europhys. Lett., 58 (3), pp. 435-441 (2002)

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

D. Lipp¹, M. Schneider², A. Gladun², S.-L. Drechsler³, J. Freudenberger³, G. Fuchs³, K. Nenkov³, K.-H. Mülcer³, T. Cichorek⁴ and P. Gegenwart⁴

¹ 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: lipp@ihm.et.tu-dresden.de

Received: 7 December 2001
Accepted: 11 February 2002

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 ${H_{\ab{c}2}(T)}$ have been measured for polycrystalline $\chem{Y}$ _x $\chem{Lu}$ $_{1-x}$ $\chem{Ni_2B_2C}$ and $\chem{Y}$ ( $\chem{Ni}$ $_{1-y}$ $\chem{Pt}$ _y)₂ $\chem{B_2C}$ samples. The linear-in-T electronic specific-heat contribution $\gamma (H) \cdot T$ exhibits significant deviations from the usual linear-in-H law resulting in a disorder-dependent negative curvature of $\gamma (H)$ . The $H_{\ab{c}2}(T)$ data point to the quasi-clean limit for $\chem{(Y,Lu)}$ -substitutions and to a transition to the quasi-dirty limit for $\chem{(Ni,Pt)}$ -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.

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

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