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Type: Artigo de periódico
Title: Electron spin resonance of Gd3+ in the antiferromagnetic heavy fermion CeIn3 and its reference compound LaIn3
Author: Bittar, EM
Duque, JGS
Venegas, PA
Rettori, C
Pagliuso, PG
Abstract: We report temperature dependent electron spin resonance (ESR) experiments of Gd3+ in CeIn3 and in its reference compound LaIn3 taken in crushed single crystals. For LaIn3 a single Dysonian Gd3+ ESR line with a nearly temperature independent g similar to 2.020(5) is observed, and its linewidth follows a Korringa-like behavior as a function of temperature. From the Korringa rate (Delta H/Delta T similar to 16 Oe/K) and g-shift (Delta g similar to 0.027) we have extracted the exchange parameter between the Gd3+ local moments and the conduction electrons (ce) in this compound. This exchange parameter J(fs) approximate to 20 meV was found to be ce wave-vector independent. For CeIn3, the Gd3+ ESR spectra were found to be weakly temperature dependent and present partly resolved Gd3+ fine-structure. Interestingly, for CeIn3, the g-shift with respect to the g-value of Gd3+ in insulators is negative, in contrast to the positive g-shift found for Gd3+ in LaIn3. These results suggests different electronic structure at the Gd3+ site in the Kondo antiferromagnet host CeIn3. Possibly, Kondo effect may cause a decrease of the s-like conduction electron density of states at the Gd3+ site, giving arise to an exchange interaction only between the Gd3+ local moment and the Ce 4f electrons. (C) 2009 Elsevier B.V. All rights reserved.
Subject: Heavy fermions
Electron spin resonance (ESR)
Electronic structure
Country: Holanda
Editor: Elsevier Science Bv
Citation: Physica B-condensed Matter. Elsevier Science Bv, v. 404, n. 19, n. 2995, n. 2998, 2009.
Rights: fechado
Identifier DOI: 10.1016/j.physb.2009.07.028
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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