Accidental Near Degeneracy of the Order Parameter for Superconducting UPt3

Ding-Chuan Chen; Anupam Garg

doi:10.1103/PhysRevLett.70.1689

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Accidental Near Degeneracy of the Order Parameter for Superconducting UPt3

Ding-Chuan Chen, Anupam Garg

DOI 10.1103/PhysRevLett.70.1689 · Physical Review Letters

T1

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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 H∥c, 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown