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Optical and Raman investigation of Yb pnictide compounds

1993; American Physical Society; Volume: 47; Issue: 10 Linguagem: Inglês

10.1103/physrevb.47.5715

1095-3795

L. Degiorgi, S. Teraoka, Giuseppe Compagnini, P. Wächter,

Physics of Superconductivity and Magnetism

We report on our thorough optical investigations of the Yb pnictide compounds, performed over a large photon-energy spectral range. From Kramers-Kronig analysis we obtain the complete excitation spectrum in terms of the optical dielectric functions. Applying a phenomenological harmonic-oscillator model we extract the unscreened plasma frequency and the resonance frequency of the transverse-optical-phonon mode. Our experimental findings suggest furthermore a d-4f electronic transition at about 0.2 eV, in agreement with high-energy electron-spectroscopy results. We also report on our Raman-effect measurements. Moreover, we compare our results with the reference material ScN and we discuss the influence of nonstoichiometry in the Yb pnictides.