Acoustic soft modes and the ferroelastic phase transition in BiVO4 and LaNbO4

B. Y. Gu Department of Physics, City College, City University of New York, New York, N.Y.; Institute of Physics, Chinese Academy of Sciences, Beijing, China

H. Z. Cummins Department of Physics, City College, City University of New York, New York, N.Y.

S. L. Qiu Department of Physics, City College, City University of New York, New York, N.Y.

M. Copic Department of Physics, City College, City University of New York, New York, N.Y.; Department of Physics, University of Ljubljana, Yadronska 19, Ljubljana, Yugoslavia

Brillouin scattering studies of BiVO4 and LaNbO4 have revealed acoustic soft modes in both crystals with similar temperature dependences, propagating normal to ferro-elastic domain walls. Raman scattering measurements show that BiVO4 has an optic soft mode while LaNbO4 does not, in agreement with previous results of other investigators. Attempts to fit the BiVO4 data to a two-coupled-oscillator model could not account for the observed temperature dependent intensities. We suggest that the frequencies of both the optic and acoustic modes are temperature dependent in both crystals.

Notes

Institute of Physics, Chinese Academy of Sciences, Beijing, China

Department of Physics, University of Ljubljana Yadronska 19, Ljubljana, Yugoslavia

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Acoustic soft modes and the ferroelastic phase transition in BiVO4 and LaNbO4

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