@article{oai:tsukuba.repo.nii.ac.jp:00017051,
 author = {小島, 誠治 and Tsukada, Shinya and Kojima, Seiji},
 issue = {14},
 journal = {Physical review B},
 month = {Oct},
 note = {application/pdf, Dynamical properties of relaxor ferroelectric 0.93Pb(Zn1/3Nb2/3)O3-0.07PbTiO3 single crystals have been studied by the broadband inelastic light scattering from gigahertz to terahertz frequency range. The longitudinal- and transverse-acoustic (LA and TA) phonon frequencies deviate below the Burns temperature TB=736  K from a linear temperature dependence above TB, indicating the existence of polarization relaxations induced by the polar nanoregions (PNRs). On further cooling, a central peak (CP) which originates from the relaxations in the PNRs is observed clearly below 600  K<TB. The CP width decreases markedly down to T*=499  K and the change in the CP width becomes mild below T*. The slower (~10−12  s) and faster (~10−13  s) relaxation times determined by the CP show good agreement with the relaxation times determined by TA and LA phonons, respectively. 180° and non-180° (71° and 109°) polarization flippings are allowed in the PNRs with the polar rhombohedral symmetry. Considering the piezoelectric coupling in a PNR, it is suggested that 180° flipping is related to the relaxation observed in LA phonon, while non-180° flipping is related to that in TA phonon.},
 title = {Broadband light scattering of two relaxation processes in relaxor ferroelectric 0.93Pb(Zn1/3Nb2/3)O3-0.07PbTiO3 single crystals},
 volume = {78},
 year = {2008}
}