Two-order-parameter theory of the phase diagram of superconducting UPt3

Anupam Garg; Ding-Chuan Chen

doi:10.1103/PhysRevB.49.479

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Two-order-parameter theory of the phase diagram of superconducting UPt3

Anupam Garg, Ding-Chuan Chen

DOI 10.1103/PhysRevB.49.479 · Physical Review B

T1

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Abstract

The H-T phase diagram of UPt3 has previously been shown to be incompatible with a two-component-vector order parameter. It is studied in this paper within the ‘‘AB’’ model, consisting of two nearly degenerate order parameters, one transforming as an A and the other as a B representation of D6h. The nature of the different one- and two-order-parameter vortex-lattice phases and the possible transitions between them are examined in detail. A quantitative comparison is made with the experimental diagram, and the parameters in the Ginzburg-Landau free energy are deduced. It is found that the flux lattice evolves continuously in the low-H, low-T phase with no additional transitions between different types of two-order-parameter lattices, and that its orientation is in accord with neutron-diffraction studies near one of the inner transition lines.

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.	0.5	Pressure not reported	unknown