UC Irvine

We report on the optical properties of the heavy fermion superconductor UBe13 from 0.050 to 2eV. The reflectance shows sharp structure at low frequencies superimposed on a smooth decrease down to 50% at 1.6eV. The ThBe13 compound is shown for comparison as a non-heavy fermion system. Kramers-Kronig analysis of reflectance measurements yields sharp interband structure in UBe13 in the 0.1 eV region. In the far IR, above 100 K, the material shows normal Drude behavior: the optical conductivity agrees well with the d.c. conductivity. © 1987.