Spin Waves in a Heusler Alloy Cu₂MnAl

抄録

The spin waves in a Heusler alloy Cu₂MnAl were investigated at several temperatures by neutron inelastic scattering. The spin wave dispersion relations along three principal directions were systematically explored across the whole magnetic Brillouin zone at 4 K. The results were analysed using the Heisenberg Hamiltonian with long range magnetic interactions. At T=493 K (T⁄T_c=0.78), the renormalization of the spin wave energy at large momentum transfer regions was found to be very small. This result is interpreted in terms of the temperature dependence of the s-d interaction at large distances.