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Title: Lattice disorder and size-induced Kondo behavior in CeAl2 andCePt2+x

Abstract

When the particle size of CeAl{sub 2} and CePt{sub 2+x} samples is reduced to the nanometer scale, antiferromagnetism is suppressed and Kondo behavior dominates. We find that the Kondo temperature T{sub K} can either decrease (CeAl{sub 2}) or increase (CePt{sub 2+x}) in the nanoparticles relative to the bulk. Extended x-ray absorption fine-structure data show that the Ce-Al and Ce-Pt environments are significantly distorted in the nanoparticles. While such distortions should strongly affect magnetic and electronic properties, we find they cannot explain the observed changes in T{sub K}. Changes in the conduction density of states or other parameters must, therefore, play a significant role.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
Sponsoring Org.:
USDOE Director. Office of Science. Office of AdvancedScientific Computing Research. Office of Basic EnergySciences
OSTI Identifier:
894233
Report Number(s):
LBNL-59846
Journal ID: ISSN 0031-9007; PRLTAO; R&D Project: 365723; TRN: US0700105
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 97; Related Information: Journal Publication Date: 2006
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; ANTIFERROMAGNETISM; FINE STRUCTURE; PARTICLE SIZE

Citation Formats

Han, S.-W., Booth, C.H., Bauer, E.D., Huang P.H., Chen, Y.Y., and Lawrence, J.M. Lattice disorder and size-induced Kondo behavior in CeAl2 andCePt2+x. United States: N. p., 2006. Web. doi:10.1103/PhysRevLett.97.097204.
Han, S.-W., Booth, C.H., Bauer, E.D., Huang P.H., Chen, Y.Y., & Lawrence, J.M. Lattice disorder and size-induced Kondo behavior in CeAl2 andCePt2+x. United States. doi:10.1103/PhysRevLett.97.097204.
Han, S.-W., Booth, C.H., Bauer, E.D., Huang P.H., Chen, Y.Y., and Lawrence, J.M. Tue . "Lattice disorder and size-induced Kondo behavior in CeAl2 andCePt2+x". United States. doi:10.1103/PhysRevLett.97.097204. https://www.osti.gov/servlets/purl/894233.
@article{osti_894233,
title = {Lattice disorder and size-induced Kondo behavior in CeAl2 andCePt2+x},
author = {Han, S.-W. and Booth, C.H. and Bauer, E.D. and Huang P.H. and Chen, Y.Y. and Lawrence, J.M.},
abstractNote = {When the particle size of CeAl{sub 2} and CePt{sub 2+x} samples is reduced to the nanometer scale, antiferromagnetism is suppressed and Kondo behavior dominates. We find that the Kondo temperature T{sub K} can either decrease (CeAl{sub 2}) or increase (CePt{sub 2+x}) in the nanoparticles relative to the bulk. Extended x-ray absorption fine-structure data show that the Ce-Al and Ce-Pt environments are significantly distorted in the nanoparticles. While such distortions should strongly affect magnetic and electronic properties, we find they cannot explain the observed changes in T{sub K}. Changes in the conduction density of states or other parameters must, therefore, play a significant role.},
doi = {10.1103/PhysRevLett.97.097204},
journal = {Physical Review Letters},
number = ,
volume = 97,
place = {United States},
year = {Tue Mar 14 00:00:00 EST 2006},
month = {Tue Mar 14 00:00:00 EST 2006}
}