Low-T ferroelectricity in antiphase domain boundaries of SrTiO3
The ferroelectric transition of bulk strontium titanate is suppressed by a combination of two effects: (1) the structural changes produced by the antiferrodistortive transition at T-a =105 K and (2) the quantum fluctuations. The structural changes are strongly perturbed within antiphase domain boundaries , and this in such a manner that a ferroelectric transition should occur in boundaries containing the tetragonal c-axis at T-c similar to 35 to 40 K. This provides a possible explanation for a number of anomalies observed in SrTiO3 at those temperatures. We report a new low-T anomaly on the lattice parameter c measured on a thin polished platelet. The above model is consistent with its sign and size, as well as with the sign and size of earlier birefringence measurements on similar samples.
Arzel, L Univ Montpellier 2, CNRS, UMR 5587, Lab Verres, F-34095 Montpellier 5, France Univ Montpellier 2, CNRS, UMR 5587, Lab Verres, F-34095 Montpellier 5, France Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France Ecole Polytech Fed Lausanne, Lab Ceram, CH-1015 Lausanne, Switzerland Univ Paris 11, Phys Solides Lab, F-91405 Orsay, France European Synchrotron Radiat Facil, F-38043 Grenoble, France
Cited References Count:17
Record created on 2006-08-21, modified on 2016-08-08