title: Critical scattering and incommensurate phase transition in antiferroelectric PbZrO3under pressure.
abstract: Antiferroelectric lead zirconate is the key ingredient in modern ferroelectric and piezoelectric functional solid solutions. By itself it offers opportunities in new-type non-volatile memory and energy storage applications. A highly useful and scientifically puzzling feature of this material is the competition between the ferro- and antiferroelectric phases due to their energetic proximity, which leads to a challenge in understanding of the critical phenomena driving the formation of the antiferroelectric structure. We show that application of hydrostatic pressure drastically changes the character of critical lattice dynamics and enables the soft-mode-driven incommensurate phase transition sequence in lead zirconate. In addition to the long known cubic and antiferroelectric phases we identify the new non-modulated phase serving as a bridge between the cubic and the incommensurate phases. The pressure effect on ferroelectric and incommensurate critical dynamics shows that lead zirconate is not a single-instability-driven system.
authors.affiliation: Peter the Great Saint-Petersburg Polytechnic University, 29 Politekhnicheskaya, 195251, St.-Petersburg, Russia.|Ioffe Institute, 26 Politekhnicheskaya, 194021, St.-Petersburg, Russia.
authors.forename: R G
authors.initials: RG
authors.lastname: Burkovsky
authors.affiliation: Peter the Great Saint-Petersburg Polytechnic University, 29 Politekhnicheskaya, 195251, St.-Petersburg, Russia.|Ioffe Institute, 26 Politekhnicheskaya, 194021, St.-Petersburg, Russia.
authors.forename: I
authors.initials: I
authors.lastname: Bronwald
authors.affiliation: Peter the Great Saint-Petersburg Polytechnic University, 29 Politekhnicheskaya, 195251, St.-Petersburg, Russia.|Ioffe Institute, 26 Politekhnicheskaya, 194021, St.-Petersburg, Russia.
authors.forename: D
authors.initials: D
authors.lastname: Andronikova
authors.affiliation: Department of Quantum Matter Physics, University of Geneva, 24, Quai Ernest Ansermet, 1211 Genéve 4, Switzerland.|Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland.
authors.forename: B
authors.initials: B
authors.lastname: Wehinger
authors.affiliation: European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Krisch
authors.affiliation: European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France.
authors.forename: J
authors.initials: J
authors.lastname: Jacobs
authors.affiliation: European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France.
authors.forename: D
authors.initials: D
authors.lastname: Gambetti
authors.affiliation: Institute of Physics, University of Silesia, ul. Uniwersytecka 4, 40-007 Katowice, Poland.
authors.forename: K
authors.initials: K
authors.lastname: Roleder
authors.affiliation: Institute of Applied Physics, Military University of Technology, ul. Kaliskiego 2, 00-908 Warsaw, Poland.
authors.forename: A
authors.initials: A
authors.lastname: Majchrowski
authors.affiliation: Peter the Great Saint-Petersburg Polytechnic University, 29 Politekhnicheskaya, 195251, St.-Petersburg, Russia.
authors.forename: A V
authors.initials: AV
authors.lastname: Filimonov
authors.affiliation: Peter the Great Saint-Petersburg Polytechnic University, 29 Politekhnicheskaya, 195251, St.-Petersburg, Russia.
authors.forename: A I
authors.initials: AI
authors.lastname: Rudskoy
authors.affiliation: Peter the Great Saint-Petersburg Polytechnic University, 29 Politekhnicheskaya, 195251, St.-Petersburg, Russia.|Ioffe Institute, 26 Politekhnicheskaya, 194021, St.-Petersburg, Russia.
authors.forename: S B
authors.initials: SB
authors.lastname: Vakhrushev
authors.affiliation: Ioffe Institute, 26 Politekhnicheskaya, 194021, St.-Petersburg, Russia.|Ceramics Laboratory, Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland.
authors.forename: A K
authors.initials: AK
authors.lastname: Tagantsev