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Evidence of upper-critical-field enhancement in K3C60 powders

G. S. Boebinger, T. T. M. Palstra, A. Passner, M. J. Rosseinsky, D. W. Murphy, and I. I. Mazin
Phys. Rev. B 46, 5876(R) – Published 1 September 1992
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Abstract

ac susceptibility measurements of superconducting K3C60 powders in magnetic fields to 30 T yield a roughly linear Hc2(T) curve extending up to the highest experimental fields. Samples prepared by two different methods give -dHc2/dT=2.14±0.08 T/K, with Tc=18.7 K. The observed Hc2 at low temperatures exceeds the Hc2(T) curve from the standard theory by Werthamer-Helfand-Hohenberg. We discuss the role of flux motion and evidence for enhancement of Hc2 by intrinsic mechanisms such as strong coupling, Fermi surface anisotropy, and/or granularity of the samples.

  • Received 29 May 1992

DOI:https://doi.org/10.1103/PhysRevB.46.5876

©1992 American Physical Society

Authors & Affiliations

G. S. Boebinger, T. T. M. Palstra, A. Passner, M. J. Rosseinsky, and D. W. Murphy

  • AT&T Bell Laboratories, Murray Hill, New Jersey 07974

I. I. Mazin

  • Max Planck Institut fur Festkorperforschung, 7000 Stuttgart 80, Germany

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Vol. 46, Iss. 9 — 1 September 1992

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