Toth, Anna, Chandra, Premala, Coleman, Piers, Kotliar, Gabriel and Amitsuka, Hiroshi (2010) Magnetization, Maxwell's relations, and the local physics of Th1-xUxRu2Si2. Physical Review B, 82 (23).
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The dilute Kondo compound, Th1-xUxRu2Si2, displays non-Fermi-liquid behavior but no zero-point entropy; it thus appears to elude description by known single-ion models. It may also provide a clue to the underlying local degrees of freedom in its dense counterpart, URu2Si2. Here we use high-resolution magnetization studies to cross-check the thermodynamic consistency of previous experiments. Measurement of the field dependence of the temperature scale, T-F(H), associated with Fermi-liquid behavior probes the nature of the underlying impurity fixed point. We find that T-F(H) grows linearly with applied field, in contrast to the quadratic form expected for the two-channel Kondo model. We use a scaling argument to show that the observed behavior of T-F(H) is consistent with the absence of zero-point entropy, suggesting novel impurity behavior in this material. More generally, we suggest the field magnetization as a probe of single-ion physics and make predictions for its behavior in other actinide compounds.
This is a Submitted version This version's date is: 13/12/2010 This item is not peer reviewed
https://repository.royalholloway.ac.uk/items/c67da5e7-0901-c652-8d68-a570d238e66d/4/
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