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(Color online) Polarized Raman spectra [(a), (b) and (c), (d)] on two different single domains, respectively; (a) and (c) in and (b) and (d) in backscattering geometry.
(a) Raman spectra taken at different applied voltages from . The Lorentzian functions used for the fit of the peaks are shown as a dotted line. (b) Peak position vs the applied voltage. The lines serve as guide to the eye.
and modes for single crystal.
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