Rotor descriptions of some perovskite compounds and alloys are possibly shown. Temperature behavior of a quantity (T1) in SrTiO3are discussed. T1is argued to serve as fingerprints in identifying the nature of a local mode. It is found with a dip around 105 K, which defies usual wisdom but proves explicable by both the eight-corner and the rotor model. A mapping may exist between these models. We then model PbZr1-xTixO3as a lattice of rotors with randomly distributed cubic anisotropy. The x-driven transition is argued to be of percolation type. Consequences are discussed and shown agreeing with observations.
- Dielectric constant
- Incipient ferroelectrics
- Quantum rotor model
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering