Abstract
The low-temperature optical response of ${\mathrm{EuB}}_{6}$ is strongly influenced by a ferromagnetic phase transition with a zero-field onset temperature ${T}_{C}$ of \ensuremath{\sim}16 K. A marked blueshift of the reflectivity plasma edge with either decreasing temperature or increasing magnetic field is observed. The corresponding temperature and field-dependent plasma-frequency shift, combined with low-field Hall data, reveals a distinct reduction of the effective mass of the itinerant charge carriers, in parallel with the onset of ferromagnetic order. A universal scaling linking the experimental data on magnetization and the Drude weight is established.
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