Electron spin resonance (ESR) of Eu2+ in type-I clathrate Eu8Ga16Ge30

Autor(es)

Holanda, L. M. ^[1] ; Vargas, J. M. ^[1] ; Rettori, C. ^[1] ; Pagliuso, P. G. ^[1] ; Bittar, E. M. ^[1] ; Avila, M. A. ^[2] ; Takabatake, T. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Dept Eletron Quant, Inst Fis Gleb Wataghin, Campinas, SP - Brazil

^[2] Hiroshima Univ, AdSM, Dept Quantum Matter, Higashihiroshima 7398530 - Japan

• Tipo de documento: Artigo Científico
• Fonte: PHYSICA B-CONDENSED MATTER; v. 404, n. 19, p. 3300-3303, OCT 15 2009.
• Citações Web of Science: 6

Resumo

We report temperature dependent X-band (nu similar to 9.5 GHz) electron spin resonance (ESR) experiments in type-I clathrate Eu(8)Ga(16)Ge(30). This system presents interesting thermoelectric properties in its paramagnetic state and orders ferromagnetically below T(C) = 35 K Although the Eu(2+) ions sits on two inequivalent sites in the type-I clathrate structure, we found in the paramagnetic state a single Dysonian Eu(2+) 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 Eu(2+) 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. (AU)

• Processo FAPESP: 06/50511-8 - Estudo de prpriedades e estruturas magneticas de novos compostos intermetalicos derivados da familia rmmnln3m+2n (r=terra-terra-rara; m=rh,ir ou co, m=1,2 e n=0,1).
• Beneficiário: Raimundo Lora Serrano
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 06/60387-2 - Estudos das propriedades e estruturas magnéticas de novos compostos intermetálicos
• Beneficiário: Raimundo Lora Serrano
• Modalidade de apoio: Auxílio à Pesquisa - Programa Primeiros Projetos