Relaxation dynamics near ferroelectric phase transitions and the central-peak phenomenon
AUTOR(ES)
Kokshenev, V.B.
FONTE
Brazilian Journal of Physics
DATA DE PUBLICAÇÃO
2000-12
RESUMO
The instability of the paraelectric phase in ferroelectrics, driven by thermal fluctuations, is discussed on the basis of the quantum three-dimensional spin-1/2 transverse-field Ising model (TIM) within the framework of the Green function method. The two-step critical dynamics of the TIM is analyzed through the ferroelectric order-parameter fluctuation spectra observed above the critical temperature Tc. The spectra profiles are given near Tc in explicit form. The slow-down exponents deltac = and deltas = are deduced for the slow and fast parts of structural relaxation and are compared with those known from the literature.
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