Počet záznamů: 1
Multiple soft-mode vibrations of lead zirconate
- 1.0431548 - FZÚ 2016 RIV US eng J - Článek v odborném periodiku
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
Grant CEP: GA ČR GA13-15110S
Institucionální podpora: RVO:68378271
Klíčová slova: antiferroelectric * soft mode * polarized spectra
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 7.512, rok: 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.
Trvalý link: http://hdl.handle.net/11104/0236165
Počet záznamů: 1