We report temperature-dependent polarized optical conductivity
[Ο(Ο)] spectra of CeFe2βAl10β, which is a reference material
for CeRu2βAl10β and CeOs2βAl10β with an anomalous magnetic
transition at 28 K. The Ο(Ο) spectrum along the b-axis differs
greatly from that in the ac-plane, indicating that this material has an
anisotropic electronic structure. At low temperatures, in all axes, a shoulder
structure due to the optical transition across the hybridization gap between
the conduction band and the localized 4f states, namely c-f
hybridization, appears at 55 meV. However, the gap opening temperature and the
temperature of appearance of the quasiparticle Drude weight are strongly
anisotropic indicating the anisotropic Kondo temperature. The strong
anisotropic nature in both electronic structure and Kondo temperature is
considered to be relevant the anomalous magnetic phase transition in
CeRu2βAl10β and CeOs2βAl10β.Comment: 5 pages, 4 figure