Neutron scattering experiments were carried out at the Institute Laue-Langevin, at IN3 triple axis spectrometer. A stoichiometric Ni₂MnGa single crystal ( [100] axis perpendicluar to the scattering plane) has been studied in the 220 - 260 K temperature range. The measurements without applied magnetic field reproduce the softening as reported in "Phonon anomaly, central peak, and microstructures in Ni₂MnGa", A. Zheludev et al., Phys. Rev B 51 (1995) 11310; the minimum in the energy being at T = 240 K for q ≅ [0.35, 0.35, 0], thus close to ξ = 1/3 as expected. At lower temperatures, i.e. 230 and 220 K, the value at the minimum increases and the dip in the branch is less pronounced. Under the application of a magnetic field of 2 T along [100], the branch at 230 K approaches that of 240 K, both being closer to the 230 K branch without applied magnetic field. Therefore a slight decrease in the P → I temperature under the application of the field could be inferred, although this is a preliminary qualitative estimation. Additional experimental data, extending both the field and temperature ranges are required in order to reach a quantitative estimation of the magnetic field effect.

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