Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/92681
Type: Artigo de periódico
Title: Electron Spin Resonance Of Gd3 + In The Antiferromagnetic Heavy Fermion Cein3 And Its Reference Compound Lain3
Author: Bittar E.M.
Duque J.G.S.
Venegas P.A.
Rettori C.
Pagliuso P.G.
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 ~ 2.020 (5) is observed, and its linewidth follows a Korringa-like behavior as a function of temperature. From the Korringa rate (Δ H / Δ T ~ 16 Oe / K) and g-shift (Δ g ~ 0.027) we have extracted the exchange parameter between the Gd3 + local moments and the conduction electrons (ce) in this compound. This exchange parameter Jfs ≈ 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. © 2009 Elsevier B.V. All rights reserved.
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Rights: fechado
Identifier DOI: 10.1016/j.physb.2009.07.028
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-70349126693&partnerID=40&md5=70fb4b6121db1519e9228a9b4886b18b
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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