Acoustic anomalies and central peak in SrBi2Ta2O9 single crystals studied by micro-Brillouin scattering
作者： Jae-Hyeon Ko , Anwar Hushur , Seiji Kojima , Bryan C. Sih , Zuo-Guang Ye
DOI: 10.1063/1.1524036
关键词: Brillouin scattering 、 Soft modes 、 Scattering 、 Ferroelectricity 、 Optics 、 Condensed matter physics 、 Phase (matter) 、 Attenuation 、 Perovskite (structure) 、 Materials science 、 Atmospheric temperature range
摘要: Acoustic properties of layered perovskite SrBi2Ta2O9 (SBT) single crystals were investigated by micro-Brillouin scattering. Two elastic stiffness coefficients, c33 and c44, defined within the pseudotetragonal crystallographic axes, corresponding sound velocities determined in temperature range between 290 773 K. The longitudinal velocity propagating along c axis was found to be very small, which can related weak interlayer bonding SBT. shows marked softening on approaching ferroelectric phase transition Tc around 600 K from both high- low-temperature sides. hypersonic attenuation increases markedly Tc, seems reflect not only bilinear coupling order parameter strain phase, but also electrostrictive paraelectric phase. Furthermore, a quasielastic central component observed near is believed partly respon...
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