Heat-diffusion central peak in the dielectric susceptibility of ferroelectric materials.

  title={Heat-diffusion central peak in the dielectric susceptibility of ferroelectric materials.},
  author={Fally and Schranz and Havlik},
  journal={Physical review. B, Condensed matter},
  volume={53 22},
Recently, low-frequency measurements ~0.1-Hz region! of the elastic susceptibility in KSCN near the orderdisorder phase transition at Tc5410 K revealed a relaxation that could be explained by entropy fluctuations. We present a phenomenological theory describing the heat-diffusion central peak in the macroscopic ~q50! dielectric susceptibility. It results from the Landau free energy and the heat-diffusion equation. The model predicts a relaxation in the ferroelectric phase at low frequencies… 

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P. Szklarz,1 M. Galązka,2 P. Zielinski,2,3 and G. Bator1,* 1Faculty of Chemistry, University of Wroclaw, Joliot-Curie 14, 50-383 Wroclaw, Poland 2The H. Niewodniczanski Institute of Nuclear Physics