Unconventional Superconducting Class in a Heavy Fermion System UPt_3

概要

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The origin of the double transition phenomenon recently found in a typical heavyFermion material UPt. is investigated. It is shown group-theoretically solely on thebasis of the known symmetries that there exists a non-trivial coupling term betweenthe preexisting spin density wave order parameter and the superconducting pairingfunction belonging to a degenerate representation with internal degree of freedom.This coupling ultimately leads to the T. splitting. Superconducting properties associ-ated with this unconventional pairing function, including the phase diagram, are dis-cussed both in the absence and presence of an applied field. Several experiments areproposed to test the present theory, in particular, the field dependence of the doubletransition is crucial to identify the symmetry of the pairing function. The existingdata are most consistent with those in the two-dimensional representations E.. or E..of the hexagonal symmetry. The possibility of similar phenomenon in other heavy Fer-mion systems is also examined.
社団法人日本物理学会の論文
1989-11-15