Infrared and optical spectroscopy of alpha and gamma-phase Ce

Details Infrared and optical spectroscopy of alpha and gamma-phase Ce Infrared and optical spectroscopy of alpha and gamma-phase Ce

2001-02-16

arxiv.org/abs/cond-mat/0102292v1

Phys. Rev. Lett. 86, 3407 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, REVTeX, 2 eps-figures, Phys.Rev.Lett., in press

Scientific paper

10.1103/PhysRevLett.86.3407

We determined the optical properties of alpha- and gamma-phase Ce in the photon energy range from 60 meV to 2.5 eV using ellipsometry and grazing incidence reflectometry. We observe significant changes of the optical conductivity, the dynamical scattering rate, and the effective mass between alpha- and gamma-cerium. The alpha-phase is characterized by Fermi-liquid frequency dependent scattering rate, and an effective mass of about 20 m_e on an energy scale of about 0.2 eV. In gamma-Ce the charge carriers have a large scattering rate in the far infrared, and a carrier mass characteristic of 5d band electrons. In addition we observe a prominent absorption feature in alpha-Ce, which is absent in gamma-Ce, indicating significant differences of the electronic structure between the two phases.

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