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Fermi resonance involving non-linear dynamical couplings in Pb(Zr,Ti)O.sub.3./sub. solid solutions
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SYSNO ASEP 0368179 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Fermi resonance involving non-linear dynamical couplings in Pb(Zr,Ti)O3 solid solutions Author(s) Wang, D. (CN)
Buixaderas, Elena (FZU-D) RID, ORCID
Iniguez, J. (ES)
Weerasinghe, J. (US)
Wang, H. (CN)
Bellaiche, L. (US)Source Title Physical Review Letters. - : American Physical Society - ISSN 0031-9007
Roč. 107, č. 17 (2011), 175502/1-175502/5Number of pages 5 s. Language eng - English Country US - United States Keywords phonons ; lattice dynamics ; PZT Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects ME08109 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z10100520 - FZU-D (2005-2011) UT WOS 000296373600021 DOI 10.1103/PhysRevLett.107.175502 Annotation 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. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2012
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