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RESEARCH PRODUCT
The manifestation of dipoles clustering in paraelectric phase of disordered ferroelectrics
Vladimir A. Stephanovichsubject
Spin glassMaterials scienceCondensed matter physicsTransition temperatureCondensed Matter PhysicsCondensed Matter::Disordered Systems and Neural NetworksFerroelectricityElectronic Optical and Magnetic MaterialsCondensed Matter::Materials ScienceElectric dipole momentDipoleMean field theoryPhase (matter)Ising modeldescription
Abstract We predict the existence of Griffiths phase in the dielectrics with concentrational crossover between dipole glass (electric analog of spin glass) and ferroelectricity. The peculiar representatives of above substances are KTaO3: Li, Nb, Na or relaxor ferroelectrics like Pb1−xLaxZr0.65Ti0.35O3. 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2001-03-01 | Ferroelectrics |