Huge upper critical field in the superconductor with non-centrosymmetric crystal structure CeCoGe3

M. A. Méasson, H. Muranaka, T. D. Matsuda, T. Kawai, Y. Haga, G. Knebel, D. Aoki, G. Lapertot, F. Honda, R. Settai, J. P. Brison, J. Flouquet, K. Shimizu, Y. Onuki

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3 Citations (Scopus)

Abstract

We report the upper critical field, Hc2, of the non-centrosymmetric compound CeCoGe3 by resistivity measurements under high pressure of 7.1 GPa, for H along c and a axis, and for a magnetic field up to 17 T. Hc2 is very anisotropic, saturating at low temperature for H along the a axis and linear for H along the c axis. Very high Hc2(T) is observed for H along the c axis, with a huge value of the slope dHc2/dT = -47 ± 1.3 T/K, the highest ever reported if normalized to the superconducting temperature of 0.65 K. This is most probably related to a conjunction of a heavy fermionic state and the absence of the Pauli limitation. A fit of Hc2(T) shows that the curves for a and c axis can be reproduced with a moderate coupling Eliashberg theory.

Original languageEnglish
Pages (from-to)S536-S538
JournalPhysica C: Superconductivity and its applications
Volume470
Issue numberSUPPL.1
DOIs
Publication statusPublished - Dec 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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