Heavy-fermion behavior in CeAl2 nanoparticles

Y. Y. Chen, Y. D. Yao, T. K. Lee, W. C. Liu, H. C. Chang, K. Y. Lin, Y. S. Lin, Z. C. Wang, W. H. Li

Research output: Contribution to journalConference articlepeer-review

Abstract

In order to examine the quantum size effects on the heavy-fermion behavior in CeAl2, we have performed measurements of the low-temperature specific heats for CeAl2 nanoparticles with average particle size 80 angstrom for temperature down to 80mK. For 80 angstrom - nanoparticles the magnitude of γ of CeAl2 can be as high as 3600mJ/K2 f.u. at T=80mK with TK ≈ 0.65K. Compared with the sharp anti-ferromagnetic order (TN=3.8K) in bulk CeAl2 only a blurred peak at same temperatures is observed in CeAl2 nanoparticles. Due to the suppression of the long-range magnetic order by the limited geometric size and the less degeneracy of the density of states of conduction electrons D(εF) the enhanced heavy-fermion behavior (in terms of γ) and the disappearance of magnetic order in CeAl2 nanoparticles are attributed to the quantum size effects in nanoparticles.

Original languageEnglish
Pages (from-to)719-724
Number of pages6
JournalNanostructured Materials
Volume12
Issue number5
DOIs
StatePublished - 1999
EventProceedings of the 1998 4th International Conference on Nanostructured Materials (NANO '98) - Stockholm, Swed
Duration: 14 Jun 199819 Jun 1998

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