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Type: Artigo de periódico
Title: Electron Spin Resonance Study Of The Local Environment For The Gd3 + And Eu2 + Ions In Ca1 - X Rx B6(r = Gd, Eu) (0.0001 ≤ X ≤ 0.30)
Author: Duque J.G.S.
Urbano R.R.
Pagliuso P.G.
Rettori C.
Schlottmann P.
Fisk Z.
Oseroff S.B.
Abstract: The environment of Gd3 + / Eu2 + (4 f7, S = frac(7, 2)) in Ca1 - x Rx B6 (R = Gd, Eu ; 0.0001 ≤ x ≤ 0.30) is studied by electron spin resonance (ESR). For x ≲ 0.001 the spectra show Lorentzian shape (insulating phase). As x increases, the spectra present a superposition of Lorentzian and Dysonian resonances (coexistence of insulating and metallic phases). For x ≳ 0.01, the line shape becomes pure Dysonian (metallic phase). Thus, the intermediate concentration regime of Ca1 - x Rx B6 is intrinsically inhomogeneous. These compounds show no weak ferromagnetism. © 2006 Elsevier B.V. All rights reserved.
Rights: fechado
Identifier DOI: 10.1016/j.jmmm.2006.10.1103
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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