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.


Published in:
Physical Review B, 64, 22, -
Year:
2001
ISSN:
1098-0121
Keywords:
Note:
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
502FP
Times Cited:10
Cited References Count:46
Laboratories:




 Record created 2006-08-21, last modified 2018-03-17


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