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Infrared lattice spectra of Tm3Al5O12 and Yb3Al5O12 single crystals

The reflectance spectra of the Tm3Al5O12 and Yb3Al5O12 single crystals have been studied at room temperature. Fifteen infrared-active modes, out of the 17 theoretically predicted, have been experimentally observed. The infrared data have been analysed by means of the Kramers-Kronig transformation to yield the complex dielectric function, the complex refractive index, the absorption coefficient, as well as the frequencies of the longitudinal (ωLO) and transverse (ωTO) long-wavelength T1u modes. Furthermore, the experimental data are compared and discussed in the light of theoretical lattice dynamical calculations based on the rigid-ion model.