Accidental near degeneracy of the order parameter for superconducting UPt3

Ding Chuan Chen*, Anupam Garg

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

66 Scopus citations

Abstract

UPt3 appears to have a tetracritical point in the H-T plane for all orientations H^ of H. Such a point can exist only if the Ginzburg-Landau (GL) "Hamiltonian" has a conserved quantity Q. It is shown that the model of a two-component vector order parameter admits a Q for Hc, but has no tetracritical point. Hence, accidentally nearly degenerate order parameters are examined, particularly the model where one behaves as an A and the other as a B representation of D6h. This model can yield a tetracritical point for all H. Its physical properties are calculated and GL parameters are fitted to experiment.

Original languageEnglish (US)
Pages (from-to)1689-1692
Number of pages4
JournalPhysical review letters
Volume70
Issue number11
DOIs
StatePublished - 1993

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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