Singlet Magnetism in Heavy Fermions

Details Singlet Magnetism in Heavy Fermions Singlet Magnetism in Heavy Fermions

1995-05-20

arxiv.org/abs/cond-mat/9505091v1

Physics

Condensed Matter

12 pages, RevTex, no figures; Phys. Rev. Lett., to appear

Scientific paper

10.1103/PhysRevLett.74.4301

We consider singlet magnetism for the uranium ions in UPt$_3$ and URu$_2$Si$_2$ assuming that time-reversal symmetry is broken for the {\em coherent state of intermediate valence}. The relative weight of the two involved configurations should be different for UPt$_3$ and URu$_2$Si$_2$. If in UPt$_3$ the configuration $5f^1$ on the U-ion prevails in the coherent state below the magnetic transition, the magnetic moment would vanish for the particular choice of the {\em ionic} wave function. In case of URu$_2$Si$_2$, the phase transition is non-magnetic in the first approximation -- the magnetic moment arises from a small admixture of a half-integer spin configuration.

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