Functional integral calculation of local magnetic moments at Ta impurities embedded in compounds: Temperature dependence
✍ Scribed by A.L. de Oliveira; M.V. Tovar Costa; N.A. de Oliveira; A. Troper
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 120 KB
- Volume
- 403
- Category
- Article
- ISSN
- 0921-4526
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✦ Synopsis
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 XFe 2 ðX ¼ Gd; YbÞ. 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.