Počet záznamů: 1

Fermi resonance involving non-linear dynamical couplings in Pb(Zr,Ti)O.sub.3./sub. solid solutions

  1. 1.
    0368179 - FZU-D 2012 RIV US eng J - Článek v odborném periodiku
    Wang, D. - Buixaderas, Elena - Iniguez, J. - Weerasinghe, J. - Wang, H. - Bellaiche, L.
    Fermi resonance involving non-linear dynamical couplings in Pb(Zr,Ti)O3 solid solutions.
    Physical Review Letters. Roč. 107, č. 17 (2011), 175502/1-175502/5 ISSN 0031-9007
    Grant CEP: GA MŠk ME08109
    Výzkumný záměr: CEZ:AV0Z10100520
    Klíčová slova: phonons * lattice dynamics * PZT
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 7.370, rok: 2011

    We have used first-principles-based simulations and Raman scattering techniques to reveal a novel dynamical phenomenon in Pb(Zr,Ti)O3 solid solutions: a Fermi resonance (FR) emerging from the non-linear coupling between ferroelectric (FE) motions and tiltings of oxygen octahedra. This FR manifests itself as the doubling of a nominally-single FE mode in a purely FE phase, when the resonant frequency of the FE mode is close to the first overtone of the tiltings. We show that the FR is the result of a non-linear coupling that is proportional to the spontaneous polarization of the material, and derive an analytical model that captures the essence of the effect.
    Trvalý link: http://hdl.handle.net/11104/0202593