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Modeling premartensitic effects in Ni2MnGa: A mean-field and Monte Carlo simulation study
Castán i Vidal, Maria Teresa; Vives i Santa-Eulàlia, Eduard; Lindgård, Per-Anker
Universitat de Barcelona
ic first-order transition line ending in a critical point. This critical point is responsible for the existence of large premartensitic fluctuations which manifest as broad peaks in the specific heat, not always associated with a true phase transition. The main conclusion is that premartensitic effects result from the interplay between the softness of the anomalous phonon driving the modulation and the magnetoelastic coupling. In particular, the premartensitic transition occurs when such coupling is strong enough to freeze the involved mode phonon. The implication of the results in relation to the available experimental data is discussed.
Transformacions martensítiques
Xarxes cristal·lines
Mètode de Montecarlo
Martensitic transformations
Crystal lattices
Monte Carlo method
(c) The American Physical Society, 1999
The American Physical Society

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