Prediction of a low-temperature ferroelectric instability in antiphase domain boundaries of strontium titanate
The structure of the antiphase domain boundaries of strontium titanate SrTiO3 that exist at temperatures below the antiferrodistortive transition, is analyzed. It is found that some boundaries are similar to Neel domain walls, as an additional component of the order parameter develops within them. We show quantitatively that at low temperatures, typically below similar to 40 K, such boundaries become unstable with respect to the development of a ferroelectric polarization. This ferroelectric transition might provide the much needed explanation for several anomalies that are experimentally observed in SrTiO3 in this temperature region.
Tagantsev, AK Ecole Polytech Fed Lausanne, Lab Ceram, CH-1015 Lausanne, Switzerland Ecole Polytech Fed Lausanne, Lab Ceram, CH-1015 Lausanne, Switzerland Univ Montpellier 2, Lab Verres, CNRS, UMR 5587, F-34095 Montpellier 5, France
Cited References Count:46
Record created on 2006-08-21, modified on 2016-08-08