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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|
|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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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