Crystal-Liquid phase transition of polarization curl density in PbTiO$_3$/SrTiO$_3$ superlattices
ORAL
Abstract
Recent studies of the temperature evolution of the polarization patterns in oxide superlattices shows complex behaviour [1-3] different from the classical ferro/paraelectric phase transitions where the polarization is the relevant order parameter to track.
Using second-principles methods as implemented in the Scale-UP [4] code we report a first-order crystal-liquid like temperature-driven phase transition in (PbTiO$_3$)$_n$/(SrTiO$_3$)$_n$ superlattices in which the relevant order parameter is related with the curl density of the polarization pattern. Different values of the perioditiy $n=8,~10,~14$ were studied showing good scaling for the phase transition.
[1] Y. Nahas, et al., Phys. Rev. Lett. 119, 117601 (2017)
[2] C. Xu, et al., Phys. Rev. B. 101, 241402 (2020)
[3] Y. Nahas, et al., Nature 577, 47–51 (2020)
[4] P. Garc\'ia-Fern\'andez, et al., Phys. Rev. B 93 195137 (2016)
Using second-principles methods as implemented in the Scale-UP [4] code we report a first-order crystal-liquid like temperature-driven phase transition in (PbTiO$_3$)$_n$/(SrTiO$_3$)$_n$ superlattices in which the relevant order parameter is related with the curl density of the polarization pattern. Different values of the perioditiy $n=8,~10,~14$ were studied showing good scaling for the phase transition.
[1] Y. Nahas, et al., Phys. Rev. Lett. 119, 117601 (2017)
[2] C. Xu, et al., Phys. Rev. B. 101, 241402 (2020)
[3] Y. Nahas, et al., Nature 577, 47–51 (2020)
[4] P. Garc\'ia-Fern\'andez, et al., Phys. Rev. B 93 195137 (2016)
*J. J., P.G.F., F.G.O Grant No. PGC2018-096955-B-C41, Spanish Ministery of Science, Innovation. F.G.O Grant No. FPU18/04661, Spanish Ministery of Universities. J.M.L Grant No.FIS2016-74957-P State Investigation Agency (Spain) and FEDER (EU).
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Presenters
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Fernando Gómez-Ortiz
- CITIMAC, Universidad de Cantabria, Avenida de los Castros s/n