Griffiths phase manifestation in disordered dielectrics

Details Griffiths phase manifestation in disordered dielectrics Griffiths phase manifestation in disordered dielectrics

2000-04-25

arxiv.org/abs/cond-mat/0004419v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

5 pages, 4 embedded postscript figures

Scientific paper

10.1007/s100510070072

We predict the existence of Griffith phase in the dielectrics with concentrational crossover between dipole glass (electric analog of spin glass) and ferroelectricity. The peculiar representatives of above substances are $KTaO_3:Li$, $Nb$, $Na$ or relaxor ferroelectrics like $Pb_{1-x}La_xZr_{0.65}Ti_{0.35}O_3$. Since this phase exists above ferroelectric phase transition temperature (but below that temperature for ordered substance), we call it "para-glass phase". We assert that the difference between paraelectric and para-glass phase of above substances is the existence of clusters (inherent to "ordinary" Griffiths phase in Ising magnets) of correlated dipoles. We show that randomness play a decisive role in Griffiths (para-glass) phase formation; this phase does not exist in a mean field approximation.

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