Abstract
Faraday rotation (FR) measurements performed on single-crystal ytterbium gallium garnet (YbGG) at 0.6328- and 1.15-μm wavelengths are presented in a magnetic field up to 20 kOe applied along the three main crystallographic directions and in the 6–300 K temperature range. At 0.6328 μm, the FR is proportional to the magnetic field and a strong anisotropy of the Verdet constant (V) is evidenced below 50 K. The FR in the infrared does not present a linear field dependence but V is isotropic. Accurate magnetic susceptibility measurements are reported on the same samples in identical H-T conditions. The temperature dependence of the Faraday rotation susceptibility differs strongly from that of the magnetic susceptibility. The results are briefly analyzed in terms of electric dipole transitions.
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