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Type: Artigo de periódico
Title: Esr Of Different Gd3+ Sites In Cab6
Author: Urbano R.R.
Rettori C.
Barberis G.E.
Torelli M.
Bianchi A.
Fisk Z.
Pagliuso P.G.
Malinowsk A.
Hundley M.F.
Sarrao J.L.
Oseroff S.B.
Abstract: The environment of Gd3+ (4f7, Sm = 7/2) ions in single crystals of Cal-xGdxB6 (0.0001≤x≤0.01) is studied by electron spin resonance (ESR). The spectra for x≤0.001 show a split spectrum due to cubic crystal field effects (CFE). The line shape of each fine structure line is Lorentzian, indicating an insulating environment for the Gd3+ ions. For 0.003≤x≤0.01, the spectra show a single resonance (g ≈ 1.992(4), ΔHl/2 ≈ 60 Oe) with no CFE and Dysonian line shape indicating metallic environment for the Gd3+ ions. For intermediate concentrations, a coexistence of spectra corresponding to insulating and metallic regions is observed. Most of the measured samples show the weak ferromagnetism (WF) as reported for Ca0.995La0.005B6, but, surprisingly, this WF has no effect in our ESR spectra either for metallic or insulating environments. This result suggests that the WF in these systems might be isolated in clusters (defect-rich regions) and its relationship with metallicity is nontrivial. © 2002 Elsevier Science B.V. All rights reserved.
Rights: fechado
Identifier DOI: 10.1016/S0921-4526(02)00764-0
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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