MCD study on CexLa1-xNi: Difference between the "local" and "coherent" Kondo effect

Satoshi Nakamura, Testuo Yoshida, Yasuhiro Takayama, Tsuneaki Miyahara, Hiroyoshi Ishii, Hitoshi Sugawara, Hideyuki Sato, Tetsuya Nakamura

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Temperature dependence of Ce 4f magnetic moment was measured on Ce xLa1-xNi (x = 1.0, 0.9, 0.8, 0.7, 0.4) using the 3d-4f core excitation magnetic circular dichroism (MCD). The bulk magnetic susceptibilities of these samples were also measured with SQUID. The two results were largely different at temperatures lower than "coherent Kondo temperature", TK. The MCD results showed the Curie-Weiss behavior but the estimated negative Weiss temperatures are remarkably lower than TK, except the case of x = 0.4 showing a positive Weiss temperature but not exhibiting the Kondo effect. It is suggested that the MCD results reflect a local spin-singlet effect with smaller binding energy, while the bulk Kondo temperatures are raised due to coherent hybridization between 4f and ligand states.

Original languageEnglish
Article number044707
Journaljournal of the physical society of japan
Volume75
Issue number4
DOIs
Publication statusPublished - 2006 Apr
Externally publishedYes

Keywords

  • Dense Kondo effect
  • Dilute Kondo effect
  • Impurity Anderson model
  • Magnetic circular dichroism
  • Magnetic susceptibility

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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