Singlet Magnetism in Heavy Fermions

Abstract

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.

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

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