Abstract
The polarized reflectivity of BaMnF4 single crystals was measured in the 20–600 cm−1 range for temperatures from 10 to 300 K. The results were evaluated using Kramers-Kronig analysis to obtain the dielectric function. The number of active modes in the high temperature polar phase (T>Ti ≃250K) is in agreement with group-theoretical expectation. In the incommensurate phaseT<Ti the number of active modes increases more than two times. All the results are in reasonable agreement with previous Raman and far infrared data.
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