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Author(s):
C.H. Choi and J. A. Sauls
Comments:
4 pages with 1 figure
Journal Ref.
Phys. Rev. Lett. 66, 484 (1991)
Abstract:
We present a theoretical explanation of the unusual temperature-dependent anisotropy of
Hc2 reported by Shivaram, et al. for single crystals of UPt3, which we
argue provides strong support for unconventional odd-parity pairing. We show that the
observed low-temperature crossover in the anisotropy ratio,
Hc2⊥/Hc2||,
can be explained by paramagnetic limiting for H parallel to the sixfold axis within BCS
pairing theory if the order parameter has odd-parity and there is strong spin-orbit coupling
of the pair spin to the crystal axes.
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