Local magnetic moments and hyperfine fields at Ta impurities diluted in XFe2 (X = Y, Gd, Yb) Laves phases compounds

Journal of the Brazilian Chemical Society

Amós Troper²  Nilson A. De Oliveira¹  Marcus V. Tovar Costa¹  Alexandre L. De Oliveira¹ 

[1] ,Centro Brasileiro de Pesquisas FísicasRio de Janeiro RJ ,Brazil

关键词: intermetallic compounds;    magnetic hyperfine fields;    impurities;   

DOI  :  10.1590/S0103-50532008000200010

来源: SciELO

【 摘 要 】

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 = Y, Gd, Yb). We use an extended two-coupled sublattice 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.

【 授权许可】

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