Abstract
ABSTRACTWe have studied an incipient ferroelectric BaZrO3 single crystal with perovskite structure by terahertz time-domain and Raman scattering spectroscopies. The phonon-polariton dispersion relation of the low-frequency infrared active TO1 and TO2 modes was studied from the real and imaginary parts of the complex dielectric constants at 8 K. The experimentally observed complex polariton dispersion relations are discussed by a damped harmonic oscillator model. First-order Raman active modes, forbidden in cubic Pmm symmetry, have been observed in a BaZrO3 single crystal, indicating the lowering of cubic symmetry.
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