Abstract

The discovery of a very large wavelength independent Faraday rotation in doped EuTe single crystals is reported. Rotations of up to 3600 deg/cm have been measured at 4.2 K. The Faraday rotation we report can be interpreted as resulting from magnetic resonance, however, a quantitative description cannot be given as yet. The large values of the wavelength independent Faraday rotation may be associated with ferromagnetic spin clusters in the otherwise nearly antiferromagnetic material. The samples are described in terms of their electrical transport parameters and the magnetic ordering temperatures.

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