Temperature-dependent x-ray diffraction study of Pd/Cu site interchange in non-Fermi liquid UCu(4)Pd Page: 3 of 4
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Table 1. Debye temperatures and offsets staticc) relative to a Debye model of the
measured displacement parameters.
Model U Pd Cu
OD (K) static (_k2) D (K) static (_k2) D (K) static (_2)
site-interchange 201(20) 0.0008(5) 263(13) 0.0009(4) 552(30) 0.0047(2)
no-interchange 213(16) 0.0009(3) 282(11) 0.0019(2) 428(16) 0.0035(2)
fits are summarized in Table 1. In this analysis, temperature-independent
offsets between the models are considered to be due to distortions or disor-
der relative to the fitting model, and are therefore evidence against a given
model. The U data shows a small offset, consistent with zero, for both mod-
els. The Pd u2 only shows a significant offset for the no-interchange model,
which is evidence that the site-interchange model is a better explanation of
these data. Interestingly, the Cu atoms show significant disorder in both
models. This long range disorder (that is, observed on the ~10 A scale) is
in contrast to the observation of local order in the U-Cu pairs observed in
the XAFS experiments .
In conclusion, we studied site-interchange in UCu4Pd with PDF anal-
ysis and found that we could only discern between the normal and the
site-interchange models through an analysis of the temperature-dependent
displacement parameters. These diffraction results are more consistent with
a site-interchange model, however, significant additional disorder is observed
in the Cu environment, likely induced by distortions due to the Pd atoms on
the 16e sites. Such distortions are likely perpendicular to the U-Cu pairs,
since no such disorder is observed in those pairs from XAFS experiments.
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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/m1/3/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.