A modified Landau–Devonshire thermodynamic potential for strontium titanate

Sheng, G.; Li, Y. L.; Zhang, J. X.; Choudhury, S.; Jia, Q. X.; Gopalan, V.; Schlom, D. G.; Liu, Z. K.; Chen, L. Q.
June 2010
Applied Physics Letters;6/7/2010, Vol. 96 Issue 23, p232902
Academic Journal
The range of reported values of the Landau energy coefficients of bulk SrTiO3 leads to uncertainty in not only the magnitude but also the direction of the calculated spontaneous polarization in SrTiO3 thin films in a state of biaxial tension. In this study, we use experimental results from strained SrTiO3 films together with phase-field simulations to refine the values of the Landau energy coefficients and report a modified thermodynamic potential for bulk strontium titanate. The transition temperatures and ferroelectric/antiferrodistortive domain stabilities predicted from this modified potential agree well with measurements on biaxially strained SrTiO3 thin films.


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