Dynamical Spin Susceptibility for Cu₂MnAl

Abstract

The dynamical magnetic susceptibility χ(q, ω) of Cu₂MnAl is evaluated on the basis of the realistic band structure which has been calculated by Mueller’s hybridized T.B.-OPW method. The effective exchange interaction U_eff^d–d is introduced as only one parameter in the present calculation. The theoretical results of the spin wave spectra of Cu₂MnAl are in good agreement with the experimental ones.
It turns out that the transitions from the majority spin bands to the minority spin bands mainly contribute to χ(q, ω). The correlation between the spin density of d-electrons of Mn and that of conduction electrons mainly contributes to the spin waves with small q, while for the spin waves with large q, the correlation between those of Mn is most important.