Hexadecapolar Kondo effect in URu$_2$Si$_2$?

Details Hexadecapolar Kondo effect in URu$_2$Si$_2$? Hexadecapolar Kondo effect in URu$_2$Si$_2$?

2011-06-28

arxiv.org/abs/1106.5768v1

Physics

Condensed Matter

Strongly Correlated Electrons

4+ pages and 1 page of supplementary material

Scientific paper

We derive the coupling of a localized hexadecapolar mode to conduction electrons in tetragonal symmetry. The derivation can be easily adapted to arbitrary multipoles in arbitrary environment. We relate our model to the two-channel Kondo (2CK) model and show that for an $f^2$-configuration, a relevant crystal field splitting in addition to the 2CK interaction is intrinsic to tetragonal symmetry. We discuss possible realizations of a hexadecapolar Kondo effect in URu$_2$Si$_2$. Solving our model we find good agreement with susceptibility and specific heat measurements in Th$_{1-x}$U$_x$Ru$_2$Si$_2$ ($x\ll1$).

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