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Title: Ytterbium divalency and lattice disorder in near-zero thermalexpansion YbGaGe

Abstract

While near-zero thermal expansion (NZTE) in YbGaGe is sensitive to stoichiometry and defect concentration, the NZTE mechanism remains elusive. We present x-ray absorption spectra that show unequivocally that Yb is nearly divalent in YbGaGe and the valence does not change with temperature or with 1% B or 5% C impurities, ruling out a valence-fluctuation mechanism. Moreover, substantial changes occur in the local structure around Yb with B and C inclusion. Together with inelastic neutron scattering measurements, these data indicate a strong tendency for the lattice to disorder, providing a possible explanation for NZTE in YbGaGe.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
Sponsoring Org.:
USDOE Director. Office of Science. Basic EnergySciences
OSTI Identifier:
919514
Report Number(s):
LBNL-60117
Journal ID: ISSN 0163-1829; PRBMDO; R&D Project: 403005; BnR: KC0302030; TRN: US0806423
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B: Rapid Communications; Journal Volume: 75; Journal Issue: 1; Related Information: Journal Publication Date: 01/2007
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTRA; DEFECTS; IMPURITIES; NEUTRONS; SCATTERING; STOICHIOMETRY; THERMAL EXPANSION; VALENCE; YTTERBIUM

Citation Formats

Booth, C.H., Christianson, A.D., Lawrence, J.M., Pham, L., Lashley, J., and Drymiotis, F.R.. Ytterbium divalency and lattice disorder in near-zero thermalexpansion YbGaGe. United States: N. p., 2006. Web.
Booth, C.H., Christianson, A.D., Lawrence, J.M., Pham, L., Lashley, J., & Drymiotis, F.R.. Ytterbium divalency and lattice disorder in near-zero thermalexpansion YbGaGe. United States.
Booth, C.H., Christianson, A.D., Lawrence, J.M., Pham, L., Lashley, J., and Drymiotis, F.R.. Mon . "Ytterbium divalency and lattice disorder in near-zero thermalexpansion YbGaGe". United States. doi:. https://www.osti.gov/servlets/purl/919514.
@article{osti_919514,
title = {Ytterbium divalency and lattice disorder in near-zero thermalexpansion YbGaGe},
author = {Booth, C.H. and Christianson, A.D. and Lawrence, J.M. and Pham, L. and Lashley, J. and Drymiotis, F.R.},
abstractNote = {While near-zero thermal expansion (NZTE) in YbGaGe is sensitive to stoichiometry and defect concentration, the NZTE mechanism remains elusive. We present x-ray absorption spectra that show unequivocally that Yb is nearly divalent in YbGaGe and the valence does not change with temperature or with 1% B or 5% C impurities, ruling out a valence-fluctuation mechanism. Moreover, substantial changes occur in the local structure around Yb with B and C inclusion. Together with inelastic neutron scattering measurements, these data indicate a strong tendency for the lattice to disorder, providing a possible explanation for NZTE in YbGaGe.},
doi = {},
journal = {Physical Review B: Rapid Communications},
number = 1,
volume = 75,
place = {United States},
year = {Mon May 08 00:00:00 EDT 2006},
month = {Mon May 08 00:00:00 EDT 2006}
}