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Temperature Dependence of Magnetic Inelastic Neutron Scattering in Mn(12%Ge) Alloy

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Jankowska-Kisielińska J., Mikke K., Milczarek J. J., Hennion B., Udovenko V. A.
Acta Physica Polonica A
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1997
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vol. 91
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issue 2
483-486
EN
A systematic study of temperature dependence of magnetic inelastic neutron scattering for itinerant antiferromagnet Mn(12%Ge) is presented. At low temperatures the experimental data are well described in terms of damped spin waves. This description becomes insufficient at least 150 K below T_{N}. In the temperature range 200-400 K the integrated intensity of distribution for energy transfer 13 THz increases by one third and the shape of the deconvoluted neutron scattering cross-section changes. These changes suggest that ca. 200 K below T_{N} an additional contribution to the inelastic neutron scattering starts to appear and that its origin is different from spin waves.
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