Evidence of upper-critical-field enhancement in K3C60 powders

G. S. Boebinger*, T. T .M. Palstra, A. Passner, M. J. Rosseinsky, D. W. Murphy, I. I. Mazin

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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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.

Original languageEnglish
Pages (from-to)5876-5879
Number of pages4
JournalPhysical Review B (Condensed Matter)
Issue number9
Publication statusPublished - 1 Jan 1992
Externally publishedYes


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