Pd/Cu Site Interchange and Non-Fermi-Liquid Behavior in UCu_4Pd

Details Pd/Cu Site Interchange and Non-Fermi-Liquid Behavior in UCu_4Pd Pd/Cu Site Interchange and Non-Fermi-Liquid Behavior in UCu_4Pd

1998-09-23

arxiv.org/abs/cond-mat/9809316v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 PostScript figures, to be published in PRL

Scientific paper

10.1103/PhysRevLett.81.3960

X-ray-absorption fine-structure measurements of the local structure in UCu_4Pd are described which indicate a probable lattice-disorder origin for non-Fermi-liquid behavior in this material. Short Pd-Cu distances are observed, consistent with 24 +/- 3% of the Pd atoms occupying nominally Cu sites. A "Kondo disorder" model, based on the effect on the local Kondo temperature T_K of this interchange and some additional bond-length disorder, agrees quantitatively with previous experimental susceptibility data, and therefore also with specific heat and magnetic resonance experiments.

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