Matches in SemOpenAlex for { <https://semopenalex.org/work/W2003281508> ?p ?o ?g. }
- W2003281508 abstract "Experiments have shown that the transition temperature of $4--75text{ensuremath{-}}text{unit}$-cell-thick $mathrm{Pb}mathrm{Ti}{mathrm{O}}_{3}$ films grown on an insulating $mathrm{Sr}mathrm{Ti}{mathrm{O}}_{3}$ substrate range between 550 and $980phantom{rule{0.3em}{0ex}}mathrm{K}$. At high temperatures (below ${T}_{c}$), the films are in a 180ifmmode^circelsetextdegreefi{} stripe domain state, polarized perpendicular to the surface, and transform at about room temperature to a single macroscopic domain. This transition is curious because the strong depolarizing field is expected to quench the spontaneous polarization. Indeed, a $10text{ensuremath{-}}text{unit}$-cell-thick $mathrm{Ba}mathrm{Ti}{mathrm{O}}_{3}$ film grown on the same substrate was found to remain in the paraelectric state even at room temperature. To understand these phenomena, we present a free energy model based on the bulk perovskite ferroelectricity model that we have previously developed. The model takes into account two interacting order parameters, the average spontaneous local off-center displacements (pseudospins) and the condensed soft mode. The model shows that at high temperatures the $mathrm{Pb}mathrm{Ti}{mathrm{O}}_{3}$ films should be in the stripe domain state and predicts in reasonable quantitative agreement with experiment the stripe period as a function of temperature and film thickness. It further predicts that at about room temperature the films would transform into a single domain state with vanishing electrical polarization but with large ionic displacements. Finally, the model explains why the properties of $mathrm{Pb}mathrm{Ti}{mathrm{O}}_{3}$ and $mathrm{Ba}mathrm{Ti}{mathrm{O}}_{3}$ are so different from each other." @default.
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- W2003281508 date "2006-09-22" @default.
- W2003281508 modified "2023-10-14" @default.
- W2003281508 title "Domain structure in ultrathin ferroelectric films: Analysis with a free energy model" @default.
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- W2003281508 doi "https://doi.org/10.1103/physrevb.74.104113" @default.
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