Phonon dispersion calculations using the Vaks model in antiferroelectric lead zirconate

作     者：D.A.Andronikova R.G.Burkovsky A.V.Filimonov A.K.Tagantsev S.B.Vakhrushev 

作者机构：Peter the Great St.Petersburg Polytechnic UniversityPolytechnicheskaya 29St.Petersburg 195251Russia Ioffe InstitutePolitekhnicheskaya 26St.Petersburg 194021Russia European Synchrotron Radiation FacilityBP 220 F-38043 Grenoble CedexFrance Ceramics LaboratorySwiss Federal Institute of Technology(EPFL)CH-1015 LausanneSwitzerland 

出 版 物：《Journal of Advanced Dielectrics》 (先进电介质学报（英文）)

年 卷 期：2015年第5卷第2期

页      面：84-88页

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：Russian Foundation for Basic Research, RFBR, (14-02-01208) Government Council on Grants, Russian Federation, (14., B25.31.0025) 

主　　题：Lead zirconate antiferroelectricity incommensurate phase 

摘      要：The calculations of low-energy phonon dispersion relations in lead zirconate(PZ)have been carried out using the Vaks *** model takes into account only five low-energy phonon modes and their *** has been shown that this model allows to achieve good agreement not only between calculated and experimental transverse acoustic phonon dispersion but also between their temperature *** has been shown 5-mode system,which describes low-energy phonon dispersion in PZ,is close to unstable *** a little change of interaction parameter can lead to lattice instability with nonzero wave vector *** vector qcrit could have any value,including irrational *** this case,system will undergo an incommensurate phase transition.