Abstract:
The two-channel Anderson lattice model which has SU (2) ⊗ SU (2) symmetry is of relevance to understanding of the magnetic, quadrupolar and superconducting phases in U1-xThxBe13 or Pr based skutterudite compounds such as PrFe4P12 or PrOs4Sb12. Possible unconventional superconducting phases of the model are explored. They are characterized by a composite order parameter comprising of a local magnetic or quadrupolar moment and a triplet conduction electron Cooper-pair. This binding of local degrees of freedom removes the entropy of the non Fermi-liquid normal state. We find superconducting transitions in the intermediate valence regime which are suppressed in the stable moment regime. The gap function is non analytic and odd in frequency: a pseudo-gap develops in the conduction electron density of states which vanishes as |ω| close to ω = 0. In the strong intermediate valent regime, the gap function acquires an additional -dependence.
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Received 28 February 2002 / Received in final form 18 April 2002 Published online 9 July 2002
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Anders, F. Composite spin-triplet superconductivity in an symmetric lattice model. Eur. Phys. J. B 28, 9–28 (2002). https://doi.org/10.1140/epjb/e2002-00195-8
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DOI: https://doi.org/10.1140/epjb/e2002-00195-8