Far infrared optical excitation in metallic uranium sulfide |
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Authors: | J. Schoenes P. Brüesch |
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Affiliation: | Laboratorium für Festkörperphysik, ETH Zürich, 8093 Zürich, Switzerland;Brown Boveri Research Center, 5401 Baden, Switzerland |
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Abstract: | Previous near normal incidence reflectivity measurements on US single crystals from 12 to 0.03 eV have been extended down to 0.0018 eV (15 cm?1). A broad plateau with a reflectivity of 90±2% is observed between 40 and 400 cm?1 with a further increase of the reflectivity below 40 cm?1. A Kramers-Kronig transformation of the data shows the existence of a resonance at 315 cm?1. From a comparison with recent neutron data and other arguments we deduce that this resonance is due to the excitation of a transverse optical phonon coupled to an f→d or d→f interband transition. |
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