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Title: Slow crossover in YbXCu{sub 4} (X = AgCd, In, Mg, Tl, Zn) intermediate valence compounds

Abstract

We compare the results of measurements of the magnetic susceptibility {chi}(T), the linear coefficient of specific heat {gamma}(T)=C(T)/T and 4f occupation number n{sub f}(T) for the intermediate valence compounds YbXCu{sub 4} (X = Ag, Cd, In, Mg, Tl, Zn) to the predictions of the Anderson impurity model, calculated in the non-crossing approximation (NCA). The crossover from the low temperature Fermi liquid state to the high temperature local moment state is substantially slower in the compounds than predicted by the NCA; this corresponds to the ''protracted screening'' recently predicted for the Anderson Lattice. We present results for the dynamic susceptibility, measured through neutron scattering experiments, to show that the deviations between theory and experiment are not due to crystal field effects, and we present x-ray-absorption fine-structure (XAFS) results that show the local crystal structure around the $X$ atoms is well ordered, so that the deviations probably do not a rise from Kondo Disorder.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab., CA (US)
Sponsoring Org.:
USDOE Director, Office of Science. Office of Basic Energy Studies (US)
OSTI Identifier:
776598
Report Number(s):
LBNL-46027
R&D Project: 403002; TRN: AH200118%%562
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Journal Article
Journal Name:
Physical Review B. Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 63; Journal Issue: 5; Other Information: Journal Publication Date: Feb. 1, 2001; PBD: 7 Jun 2000
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ATOMS; CRYSTAL FIELD; CRYSTAL STRUCTURE; FERMI GAS; FINE STRUCTURE; MAGNETIC SUSCEPTIBILITY; NEUTRONS; SCATTERING; SPECIFIC HEAT; VALENCE; MIXED VALENCE XAFS NON-CROSSING APPROXIMATION

Citation Formats

Lawrence, J.M., Riseborough, P.S., Booth, C.H., Sarrao, J. L., Thompson, J.D., and Osborn, R. Slow crossover in YbXCu{sub 4} (X = AgCd, In, Mg, Tl, Zn) intermediate valence compounds. United States: N. p., 2000. Web.
Lawrence, J.M., Riseborough, P.S., Booth, C.H., Sarrao, J. L., Thompson, J.D., & Osborn, R. Slow crossover in YbXCu{sub 4} (X = AgCd, In, Mg, Tl, Zn) intermediate valence compounds. United States.
Lawrence, J.M., Riseborough, P.S., Booth, C.H., Sarrao, J. L., Thompson, J.D., and Osborn, R. Wed . "Slow crossover in YbXCu{sub 4} (X = AgCd, In, Mg, Tl, Zn) intermediate valence compounds". United States.
@article{osti_776598,
title = {Slow crossover in YbXCu{sub 4} (X = AgCd, In, Mg, Tl, Zn) intermediate valence compounds},
author = {Lawrence, J.M. and Riseborough, P.S. and Booth, C.H. and Sarrao, J. L. and Thompson, J.D. and Osborn, R.},
abstractNote = {We compare the results of measurements of the magnetic susceptibility {chi}(T), the linear coefficient of specific heat {gamma}(T)=C(T)/T and 4f occupation number n{sub f}(T) for the intermediate valence compounds YbXCu{sub 4} (X = Ag, Cd, In, Mg, Tl, Zn) to the predictions of the Anderson impurity model, calculated in the non-crossing approximation (NCA). The crossover from the low temperature Fermi liquid state to the high temperature local moment state is substantially slower in the compounds than predicted by the NCA; this corresponds to the ''protracted screening'' recently predicted for the Anderson Lattice. We present results for the dynamic susceptibility, measured through neutron scattering experiments, to show that the deviations between theory and experiment are not due to crystal field effects, and we present x-ray-absorption fine-structure (XAFS) results that show the local crystal structure around the $X$ atoms is well ordered, so that the deviations probably do not a rise from Kondo Disorder.},
doi = {},
journal = {Physical Review B. Condensed Matter and Materials Physics},
number = 5,
volume = 63,
place = {United States},
year = {2000},
month = {6}
}