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Type: Artigo de evento
Title: Spin Disorder Resistivity And Electronic Specific Heat Of Gd 4(co 1-xcu X) 3 Compounds
Author: Seixas T.M.
Salgueiro Da Silva M.A.
De Lima O.F.
Lopez J.
Braun H.F.
Eska G.
Abstract: In this work, we present a study of the spin disorder resistivity (ρ m∞) and the electronic specific heat coefficient (γ) in Gd 4(Co 1-xCu x) 3 compounds, with x = 0, 0.05, 0.10, 0.20, 0.30. The experimental results show a strongly non-linear dependence of ρ m∞ on the de Gennes factor which, in similar intermetallic compounds, is usually attributed to the existence of spin fluctuations on the Co 3d bands and its amplification by the thermal disorder of the Gd magnetic moments through the Gd-Co exchange coupling. Using a novel combined analysis of ρ m∞ and γ, we show, however, that only electron band structure changes are involved in the anomalous behaviour of ρ m∞, and that a linear dependence of ρ m∞ on the de Gennes factor is obtained when the variation of the effective mass is properly taken into account.
Rights: fechado
Identifier DOI: 
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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