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- W2078360528 abstract "The Phi4 potential is widely employed for modelling systems that undergo displacive phase transition of the soft mode or order/disorder. A molecular dynamic simulation is used to establish where the crossover lies between the two regimes, considering both limits of long range and short range intersite interactions. It appears that with both ranges of interaction the crossover occurs when the on-site potential changes from a single to a double well. The behaviour of the soft mode frequency omega is also investigated, and in particular the ratio of the slopes d omega 2/dT between T>Tc and T<Tc. The authors find this ratio attains the value -2 given by standard renormalized phonon theory only the double limit of long range coupling and extreme soft mode behaviour. The order parameter varies as (Tc-T)1/2 over a wide temperature range, as observed in several materials, in this double limit only." @default.
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- W2078360528 date "1992-05-25" @default.
- W2078360528 modified "2023-09-25" @default.
- W2078360528 title "Crossover between displacive and order/disorder behaviour in the Phi<sup>4</sup>model" @default.
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- W2078360528 doi "https://doi.org/10.1088/0953-8984/4/21/005" @default.
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