An Orbitally Degenerate Spin Fluctuation Model for Heavy Fermion Superconductivity

Details An Orbitally Degenerate Spin Fluctuation Model for Heavy Fermion Superconductivity An Orbitally Degenerate Spin Fluctuation Model for Heavy Fermion Superconductivity

1994-03-03

arxiv.org/abs/cond-mat/9403018v1

Phys Rev B 50, 6904 (1994)

Physics

Condensed Matter

42 pages (plain TeX with macros), plus 11 postscript figures

Scientific paper

10.1103/PhysRevB.50.6904

In this paper, a generalization of standard spin fluctuation theory is considered by replacing the simple Hubbard interaction by the screened Hartree-Fock interaction for f electrons. This model is then used in both an LS and a JJ coupling scheme to construct the particle-particle scattering vertex in an on-site approximation. This vertex is shown to lead to an instability for a superconducting pair state which obeys Hunds rules, with L=5, S=1, and J=4. The degeneracy of this state is broken by anisotropy of the quasiparticle wavefunctions. Detailed calculations are presented for the case of $UPt_3$.

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