Abstract
The phonon dispersion relations in Mn-rich γ-MnCu alloys have been studied by means of neutron inelastic scattering. At the martensitic transformation, the [100] longitudinal phonon branch shows softening near the \( \varGamma \) point. In addition, the elastic constant C 12 is negative in a certain temperature range near the transition and the structural phase transition is caused by the vanishing of C 11 +2 C 12 . This mechanism of the martensitic transformation can successfully explain the peculiar properties of the γ-MnCu alloy system and the difference between this alloy and the γ-MnNi system. The tetragonal lattice deformation in the γ-MnCu alloy may be considered to be induced by the magnetic coupling force which accompanies the long-range magnetic order.
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