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

Troper, Amós¹  Oliveira, Nilson A. de¹  Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, Brazil¹  Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil¹  Centro Federal de Educação Tecnológica de Química de Nilópolis / RJ, Nilópolis, Brazil¹  Oliveira, Alexandre L. de¹  Costa, Marcus V. Tovar¹ 

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

DOI  :  10.1590/S0103-50532008000200010

学科分类：化学（综合）

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】

Unknown