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Fermi resonance involving nonlinear dynamical couplings in Pb(Zr,Ti)O3 solid solutions.

Authors :
Wang D
Buixaderas E
Íñiguez J
Weerasinghe J
Wang H
Bellaiche L
Source :
Physical review letters [Phys Rev Lett] 2011 Oct 21; Vol. 107 (17), pp. 175502. Date of Electronic Publication: 2011 Oct 17.
Publication Year :
2011

Abstract

We have used first-principles-based simulations and Raman scattering techniques to reveal a novel dynamical phenomenon in Pb(Zr,Ti)O(3) solid solutions: a Fermi resonance (FR) emerging from the nonlinear 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 nonlinear coupling that is proportional to the spontaneous polarization of the material and derive an analytical model that captures the essence of the effect.<br /> (© 2011 American Physical Society)

Details

Language :
English
ISSN :
1079-7114
Volume :
107
Issue :
17
Database :
MEDLINE
Journal :
Physical review letters
Publication Type :
Academic Journal
Accession number :
22107534
Full Text :
https://doi.org/10.1103/PhysRevLett.107.175502