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Temperature Dependent Raman Scattering in CsTiOAsO4 Single Crystal

  • A.R. Guo (a1), C.-S. Tu (a2), Ruiwu Tao (a1), R.S. Katiyar (a1), Ruyan Guo (a3) and A.S. Bhalla (a3)...

Abstract

The longitudinal (LO) and transverse (TO) A1 vibrational modes have been measured between 30-1200 cm−1 as a function of temperature (30–1240 K) for CsTiOAsO4 (CTA). The frequencies for all corresponding Raman components shifted to lower frequencies on increasing the temperature, however, there is no typical soft-mode like behavior observed in the measured frequency range. The relative intensities of the low frequency bands increase dramatically with increasing temperature due to high mobility of Cs+ ion. A higher symmetry structure taking place above 940K has been confirmed by changes in the phonon spectra.

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