Abstract
We report on measurements of the thermal diffuse X-ray intensity from a single crystal of Ni2MnGa in the temperature range 180 to 250 K. The martensitic phase transition is clearly to be seen. It is accompanied by a strong soft-mode behaviour in the transverse acoustic phonon branch with q along the (110) direction and polarization along (110) in the high-temperature phase. A peak splitting and a super-structure characterize the low-temperature martensitic phase.
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