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|Type:||Artigo de evento|
|Title:||Thermopower Of An Intermediate Valence Model Of Tl2mn 2o7|
|Abstract:||In this work we calculate the thermopower of Tl2Mn 2O7, together with its static resistivity and dynamical conductivity. This compound exhibits colossal magnetoresistance, which is not adequately explained by the double-exchange mechanism. We use Hubbard operators to reformulate a previous model of Ventura and Alascio that describes the 3d orbitals of Mn with two magnetic configurations, hybridized with a conduction band associated to the Tl. We reformulate a previous treatment to obtain approximate one-electron green's functions (GF) for the model. We have employed these GF to calculate the properties mentioned above for several values of the system parameters and obtained a qualitative agreement with the experimental results. © 2004 Elsevier B.V. All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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