Measurement of the A1-modes reflectivity of BaTiO3 |
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| Authors: | JA Sanjurjo SPS Porto E Silberman |
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| Institution: | Instituto de Física “Gleb Wataghin”, Universidade Estadual de Campinas Caixa Postal 1170, 13100 Campinas, S～ao Paulo, Brasil;Fisk University, Nashville, TN, USA |
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| Abstract: | Previous polarized infrared reflectivity spectra of BaTiO3 were unable to show the expected differences between the A1 and E phonons. This can be explained by the small penetration of light polarized perpendicularly to the ferroelectric axis in the LO-TO range of the lowest E phonon, where only the crystal surface determines the reflection of light. We show that with an adequate etching of a mono-domain single-crystal it is possible to obtain good quality spectra for both polarizations. |
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