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Type: Artigo de periódico
Title: Electron spin resonance (ESR) of Eu2+ in type-I clathrate Eu8Ga16Ge30
Author: Holanda, LM
Vargas, JM
Rettori, C
Pagliuso, PG
Bittar, EM
Avila, MA
Takabatake, T
Abstract: We report temperature dependent X-band (nu similar to 9.5 GHz) electron spin resonance (ESR) experiments in type-I clathrate Eu8Ga16Ge30. This system presents interesting thermoelectric properties in its paramagnetic state and orders ferromagnetically below T-C = 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 similar to 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 (Delta H/Delta T similar to 1 (1) Oe/K) and g-shift (Delta g similar to 0.01(1)) from ESR experiments combined with the magnetic susceptibility and specific heat data. (c) 2009 Elsevier B.V. All rights reserved.
Subject: Clathrate
Korringa relaxation
Density of states
Country: Holanda
Editor: Elsevier Science Bv
Citation: Physica B-condensed Matter. Elsevier Science Bv, v. 404, n. 19, n. 3300, n. 3303, 2009.
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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