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Multiple soft-mode vibrations of lead zirconate
- 1.0431548 - FZÚ 2016 RIV US eng J - Journal Article
Hlinka, Jiří - Ostapchuk, Tetyana - Buixaderas, Elena - Kadlec, Christelle - Kužel, Petr - Gregora, Ivan - Kroupa, Jan - Savinov, Maxim - Klíč, Antonín - Drahokoupil, Jan - Etxebarria, I. - Dec, J.
Multiple soft-mode vibrations of lead zirconate.
Physical Review Letters. Roč. 112, č. 19 (2014), "197601-1"-"197601-5". ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA ČR GA13-15110S
Institutional support: RVO:68378271
Keywords : antiferroelectric * soft mode * polarized spectra
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 7.512, year: 2014
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. Count 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.
Permanent Link: http://hdl.handle.net/11104/0236165
Number of the records: 1