Local magnetic moment formation at ~(119)Sn Mossbauer impurity in RCo_2 (R=Gd,Tb,Dy, Ho,Er) Laves phase compounds

摘要

In this work, we theoretically study the local magnetic moment formation and the systematics of the magnetic hyperfine fields at a Mosbauer ~(119)Sn impurity diluted at the R site (R = Gd,Tb,Dy, Ho,Er) of the cubic Laves phase intermetallic compounds RCo_2. One considers that the magnetic hyperfine fields have two contributions, (i) the contribution from R ions, calculated via an extended Daniel-Friedel [J. Phys. Chem. Solids 24, 1601 (1963)] model, and (ii) the contribution from the induced magnetic moments arising from the Co neighboring sites. Our calculated self-consistent total magnetic hyperfine fields are in a good agreement with recent experimental data.