Abstract
A pairing mechanism for a heavy Fermion superconductor UPt 3 is proposed on the basis of spin fluctuation theory. The main attractive interaction comes from the ferromagnetic fluctuation while the antiferromagnetic fluctuation is also involved into the pair formation. The proposed mechanism gives a new interpretation to the double transitions, lending further support to our previous spin space degenerate scenario where the order parameter is characterized by a non-unitary triplet pairing belonging to one-dimensional representation in weak spin-orbit coupling. Based on the derived free energy functional the phase diagrams for two principal field orientations of hexagonal crystal are constructed. We analyze the recent Knight shift experiment in detail. It is pointed out that a novel heavy Fermi liquid state whose band width T K ∼10 K almost isotropic in spin space must exist at the Fermi surface. Several decisive experiments are proposed to check our proposals.
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