Functional integral calculation of local magnetic moments at Ta impurities embedded in XFe2 (X = Gd, Yb) compounds : Temperature dependence

In this work, we study the systematics, at finite temperature, of the formation of local magnetic moments at a Ta impurity diluted in intermetallic Laves phases compounds XFe2 (X=Gd,Yb). We use an extended two-coupled sublattices Hubbard Hamiltonian, to describe the Laves phases host. The d-d electr...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2008-04, Vol.403 (5-9), p.1408-1410
Main Authors: DE OLIVEIRA, A. L, TOVAR COSTA, M. V, DE OLIVEIRA, N. A, TROPER, A
Format: Article
Language:English
Subjects:
Exact sciences and technology
Physics
Online Access:Get full text
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Summary:In this work, we study the systematics, at finite temperature, of the formation of local magnetic moments at a Ta impurity diluted in intermetallic Laves phases compounds XFe2 (X=Gd,Yb). We use an extended two-coupled sublattices Hubbard Hamiltonian, to describe the Laves phases host. The d-d electronic interaction is treated via a functional integral approach in the quasi-static saddle point approximation. Temperature dependent pressure effects are included considering induced electron-phonon interaction which renormalizes the pure electron hybridization. The calculated magnetic hyperfine fields related to the obtained local magnetic moments, are in a quite good agreement with available experimental data.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2007.10.364