Multiple Soft-Mode Vibrations of Lead Zirconate

被引：121

作者：

Hlinka, J. ^{[1
]}

Ostapchuk, T. ^{[1
]}

Buixaderas, E. ^{[1
]}

Kadlec, C. ^{[1
]}

Kuzel, P. ^{[1
]}

Gregora, I. ^{[1
]}

Kroupa, J. ^{[1
]}

Savinov, M. ^{[1
]}

Klic, A. ^{[1
]}

Drahokoupil, J. ^{[1
]}

Etxebarria, I. ^{[2
]}

Dec, J. ^{[3
]}

机构：

[1] Acad Sci Czech Republ, Inst Phys, Prague 18221 8, Czech Republic

[2] Euskal Herriko Unibertsitatea, Zientzia & Teknol Fak, Bilbao 48080, Spain

[3] Silesian Univ, Inst Mat Sci, PL-40007 Katowice, Poland

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 19期

关键词：

CALCIUM-CHLORIDE DIHYDRATE; PHASE-TRANSITIONS; ANTIFERROELECTRIC PBZRO3; DYNAMICAL PROPERTIES; LATTICE-DYNAMICS; INSTABILITIES; PEROVSKITES; DEPENDENCE; SCATTERING; PRESSURE;

D O I：

10.1103/PhysRevLett.112.197601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Polarized Raman, IR, and time-domain THz spectroscopy of orthorhombic lead zirconate single crystals have yielded a comprehensive picture of temperature-dependent quasiharmonic frequencies of its low-frequency phonon modes. It is argued that these modes primarily involve vibrations of Pb ions and librations of oxygen octahedra. Their relation to phonon modes of the parent cubic phase is proposed. Counts of the observed IR and Raman active modes belonging to distinct irreducible representations agree quite well with group-theory predictions. Analysis of the results yields insight into the phase transition mechanism, involving a soft ferroelectric branch coupled by a trilinear term to another two oxygen octahedra tilt modes.

引用

页数：5

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