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Type: Artigo de periódico
Title: Evolution of the Eu2+ local environment in Ca1-xEuxB6
Author: Urbano, RR
Pagliuso, PG
Sarrao, JL
Oseroff, SB
Rettori, C
Bianchi, A
Nakatsuji, S
Fisk, Z
Abstract: The local environment of Eu2+ (4f(7), S = 7/2) in Ca1-xEuxB6 (0.003 <= x <= 0.10 and x = 1.00) was studied by electron spin resonance. For x = 0.003 the spectra show resolved fine and hyperfine structure due to the electric cubic crystal field and nuclear hyperfine field, respectively. The observed Lorentzian line shape indicates an insulating environment for the Eu2+ ions. As x increases (x > 0.003) the lines broaden and became Dysonian in shape, suggesting a metallic environment for the Eu2+ ions. In contrast to our previous work in Ca1-xGdxB6; the resolved fine structure can be observed in the metallic regime up to x similar or equal to 0.10 and no coexistence of insulating/metallic-like spectra was found. (C) 2003 Elsevier B. V. All rights reserved.
Subject: CaB6
crystal electric field
electron paramagnetic resonance
Country: Holanda
Editor: Elsevier Science Bv
Citation: Journal Of Magnetism And Magnetic Materials. Elsevier Science Bv, v. 272, n. E1659, n. E1661, 2004.
Rights: fechado
Identifier DOI: 10.1016/j.jmmm.2004.01.038
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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