Lattice Disorder And Size-Induced Kondo Behavior in CeAl(2) And CePt(2+X)

Journal Article · Thu Jul 19 04:00:00 EDT 2007 · Phys.Rev.97:097204,2007

OSTI ID:910048

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: Stanford Linear Accelerator Center (SLAC)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 910048
• Report Number(s): SLAC-REPRINT-2006-259
• Journal Information: Phys.Rev.97:097204,2007, Journal Name: Phys.Rev.97:097204,2007 Vol. 97; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CERIUM ALLOYS
CRYSTAL LATTICES
KONDO EFFECT
NANOSTRUCTURES
ORDER-DISORDER TRANSFORMATIONS
Other
OTHER
PARTICLE SIZE
PLATINUM ALLOYS