Počet záznamů: 1  

Multiple soft-mode vibrations of lead zirconate

  1. 1. 0431548 - FZU-D 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
    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