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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