MAGNETIC AND MAGNETOOPTICAL PROPERTIES OF EUGAG SINGLE-CRYSTALS

Faraday rotation (FR) measurements are made on single crystals of europium gallium garnet (EuGaG) at 1152, 632.8, and 543.5 nm in a magnetic field up to 20 kOe applied parallel to the three main crystallographic directions in the 5-540 K temperature range. For the three wavelengths, the FR is proportional to the magnetic field and the Verdet constant V show no anisotropy, even at low temperatures, within the experimental accuracy. The experimental Verdet constants are compared to different models for paramagnetic compounds. In the visible range of the spectrum, V543.5 may be slightly affected by the proximity of Eu3+ transitions. Magnetic susceptibility chi-measurements are reported on the same samples in similar H-T conditions. The paramagnetic behaviour of chi and V are compared as a function of temperature and wavelength.