Abstract

Resistivity [\ensuremath{\rho}(\ensuremath{\omega})] measurements are reported in the millimeter-wave spectral range over the temperature interval from 1.3 to 300 K in the heavy-fermion compound ${\mathrm{UPt}}_{3}$. Below 148 GHz the low-temperature (T4 K) data are in agreement with a Drude expression, with an enhanced relaxation time. The effective mass is derived from \ensuremath{\rho}(\ensuremath{\omega}) and is compared with the thermodynamic effective mass.

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