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Melting of crystals of polarization vortices and chiral phase transitions in oxide superlattices

Abstract: We study the equilibrium arrangements of polarization vortices in (PbTiO3 )n/(SrTiO3 )n superlattices by means of second-principles simulations. We find that, at low temperatures, polarization vortices organize in a regular arrangement in which clockwise and counterclockwise vortices alternate positions, leading to a crystal-like structure with well-defined handedness. This chiral crystal melts at a critical temperature TM into a chiral liquid where long-range order is lost but handedness is preserved. At even higher temperatures TC, a second pase transition occurs at which the chiral liquid of polarization vortices loses its handedness. Both phase transitions can be readily identified by the adequate choices of order parameters.

 Autoría: Gómez-Ortiz F., García-Fernández P., López J.M., Junquera J.,

 Fuente: Physical Review B, 2022, 105, L220103

 Editorial: American Physical Society

 Fecha de publicación: 15/06/2022

 Nº de páginas: 6

 Tipo de publicación: Artículo de Revista

 DOI: 10.1103/PhysRevB.105.L220103

 ISSN: 1098-0121,1550-235X,2469-9950,2469-9969

 Proyecto español: PGC2018-096955-B-C41

 Url de la publicación: https://doi.org/10.1103/PhysRevB.105.L220103