Temperature-dependent x-ray diffraction study of Pd/Cu site interchange in non-Fermi liquid UCu(4)Pd Page: 1 of 4
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Temperature-dependent x-ray diffraction study of Pd/Cu
site interchange in non-Fermi liquid UCu4Pd *
S.-W. HAN, C. H. BOOTH
Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley,
California 94720, USA
E. D. BAUER, M. B. MAPLE
Physics Department, University of California, San Diego, California 92093, USA
A pair distribution function (PDF) analysis of temperature-dependent
x-ray diffraction measurements from UCu4Pd is presented. Fits to the dis-
placement parameters (u2's) with a Debye model show better agreement
with a model that includes 25% of the Pd atoms on 16e (Cu) sites. In ad-
dition, significant non-thermal disorder is observed in the Cu environment,
in contrast to previous measurements of local order in the U-Cu pairs.
PACS numbers: 72.15.Qm, 61.10.Ht, 71.23.-k, 71.27.+a
UCu4Pd displays typical non-Fermi liquid (NFL) characteristics, such
as a logarithmically diverging electronic part of the heat capacity, AC1/T
and the magnetic susceptibility, X(T), as well as linear behavior in the low
temperature electrical resistivity, p(T) . X-ray absorption fine-structure
(XAFS) measurements  have shown that between 20-30% of the Pd atoms
in this nominally 015b structure sit on the 16e (nominally Cu) sites. Al-
though this amount of disorder is fairly substantial, subsequent XAFS mea-
surements  of the U-Cu pairs did not display the kind of disorder nec-
essary for the Kondo disorder model (KDM)  to generate the measured
divergences without invoking some other mechanism besides simple lattice
disorder combined with a tight-binding model for the f-electron/conduction
* We gratefully acknowledge the support from the scientists of the BESSRC-CAT at
Advanced Photon Source (APS). Use of the APS was supported by the U.S. DOE,
Office of Science (OS), Office of Basic Energy Science(OBES), under Contract No.
W-31-109-Eng-38. This work was partially supported by the Director, OS, OBES,
Chemical Sciences Division, U.S. DOE under Contract No. DE-AC03-76SF00098.
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Han, S.-W.; Booth, C.H.; Bauer, E.D. & Maple, M.B. Temperature-dependent x-ray diffraction study of Pd/Cu site interchange in non-Fermi liquid UCu(4)Pd, article, June 1, 2002; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc741228/m1/1/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.