Abstract
The transverse dynamical spin susceptibility χ -+ ( q , ω) of Ni 2 MnSn is calculated within RPA with use of the energy values and the wave functions determined by the T.B.-OPW method and the spin wave spectra are evaluated. The effective exchange interaction U d-d eff is introduced as only one parameter. The correspondence between theoretical results and experimental ones is fairly good. It is evaluated how the correlation between the spin density of d-electrons of Mn and that of conduction electrons changes with increasing q in comparison to the cases of Cu 2 MnAl and Pd 2 MnSn obtained before. The spin wave excitations of Ni 2 MnSn are investigated by examining the relation between spin wave excitations and Stoner ones.
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