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

Abstract

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.

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

References in corpus (2)

• Disorder-driven non-Fermi liquid behavior in Kondo alloys
• Kondo disorder: a possible route towards non-Fermi liquid behavior

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• Glassy Spin Dynamics in Non-Fermi-Liquid UCu_{5-x}Pd_x, x = 1.0 and 1.5
• Disorder, inhomogeneity and spin dynamics in f-electron non-Fermi liquid systems
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• Effective model of the electronic Griffiths phase
• Order and nFl Behavior in UCu4Pd
• Effects of lattice disorder in the UCu_(5-x)Pd_(x) system
• Transport properties of moderately disordered UCu${}_4$Pd
• Griffiths phase of the Kondo insulator fixed point
• Emergence of non-Fermi liquid dynamics through non-local correlations in an interacting disordered system
• Quantum Critical Fluctuations in the Heavy fermion compound Ce(Ni${}_{0.935}$Pd${}_{0.065}$)${}_2$Ge${}_2$
• Effect of annealing on glassy dynamics and non-Fermi liquid behavior in UCu_4Pd