Dynamical Spin Susceptibility for Cu2MnAl

Abstract

The dynamical magnetic susceptibility χ( q , ω) of Cu 2 MnAl 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 d-d eff is introduced as only one parameter in the present calculation. The theoretical results of the spin wave spectra of Cu 2 MnAl 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.