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Type: Artigo de periódico
Title: Electron Spin Resonance (esr) Of Eu2 + In Type-i Clathrate Eu8 Ga16 Ge30
Author: Holanda L.M.
Vargas J.M.
Rettori C.
Pagliuso P.G.
Bittar E.M.
Avila M.A.
Takabatake T.
Abstract: We report temperature dependent X-band (ν ~ 9.5 GHz) electron spin resonance (ESR) experiments in type-I clathrate Eu8 Ga16 Ge30. This system presents interesting thermoelectric properties in its paramagnetic state and orders ferromagnetically below TC = 35 K. Although the Eu2 + ions sits on two inequivalent sites in the type-I clathrate structure, we found in the paramagnetic state a single Dysonian Eu2 + ESR line with a nearly temperature independent g ~ 2 is observed, and its linewidth follows a Korringa-like behavior as a function of temperature. The microscopic details of the exchange coupling between the Eu2 + local moments and the conduction-electrons (c-e) in this compound are investigated through the obtained Korringa rate (Δ H / Δ T ~ 1 (1) Oe / K) and g-shift (Δ g ~ 0.01 (1)) from ESR experiments combined with the magnetic susceptibility and specific heat data. © 2009 Elsevier B.V. All rights reserved.
Rights: fechado
Identifier DOI: 10.1016/j.physb.2009.07.094
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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