Abstract :
We have found two distinctive structural modulations altering evidently along with the martensitic transition (MT) in the Ni2FeGa alloy. The first one (q1), corresponding to the well-known phonon anomalies in the [ζζ0] TA2 branch, occurs along the 〈110〉 direction. The second one (q2), an incommensurate modulation observed for the first time, occurs along the 〈211〉-direction. Both modulations change gradually with the premartensitic phonon softening and discontinuously with the MT. Anomalies in magnetic properties emerging around the MT have been briefly discussed.
