Abstract
The temperature dependence of the ultrasonic attenuation and velocity was measured in a ${\mathrm{Ni}}_{2}\mathrm{MnGa}$ single crystal in the temperature range from above a weakly first-order intermediate phase transition at ${T}_{I}\ensuremath{\sim}265\mathrm{K}$ down to the martensitic phase-transformation temperature, ${T}_{M}\ensuremath{\sim}220\mathrm{K}.$ The martensitic phase transformation occurs as a two-step process. The behavior of the velocity and attenuation in this premartensitic phase, ${T}_{I}>T>{T}_{M},$ is consistent with neutron-scattering data and shows that the premartensitic phase is a more ordered modulated phase than the parent phase. While precursor effects are observed above ${T}_{I},$ the martensitic phase transformation occurs abruptly. These results are compared with neutron-scattering results, transmission electron microscopy, and previous ultrasonic studies in ${\mathrm{Ni}}_{2}\mathrm{MnGa}$ and martensitic phase transformations in other metals.
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