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Temperature Dependent Raman Scattering in CsTiOAsO4 Single Crystal

Published online by Cambridge University Press:  21 February 2011

A.R. Guo,
C.-S. Tu,
Ruiwu Tao,
R.S. Katiyar,
Ruyan Guo and
A.S. Bhalla
A.R. Guo
Affiliation:
Department of Physics, University of Puerto Rico, Rio Piedras, PR 00931-3343
C.-S. Tu
Affiliation:
Department of Physics, Fu-Jen University, Taipei, Taiwan.
Ruiwu Tao
Affiliation:
Department of Physics, University of Puerto Rico, Rio Piedras, PR 00931-3343
R.S. Katiyar
Affiliation:
Department of Physics, University of Puerto Rico, Rio Piedras, PR 00931-3343
Ruyan Guo
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
A.S. Bhalla
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
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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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References

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