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

Journal Article · Tue Mar 14 04:00:00 EST 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.97.097204· OSTI ID:894233

Han, S -W; Booth, C H; Bauer, E D; Huang, P H; Chen, Y Y; Lawrence, J M

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.

• Research Organization: Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
• Sponsoring Organization: USDOE Director. Office of Science. Office of AdvancedScientific Computing Research. Office of Basic EnergySciences
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 894233
• Report Number(s): LBNL--59846
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Vol. 97; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
ANTIFERROMAGNETISM
FINE STRUCTURE
PARTICLE SIZE