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Singlet Magnetism in Heavy Fermions

Victor Barzykin·Lev P. Gor'kov
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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.

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Victor Barzykin, Lev P. Gor'kov. 1995-05-20. Singlet Magnetism in Heavy Fermions. https://doi.org/10.1103/physrevlett.74.4301

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