Measurements of the magneto-optical rotation in CdCr2Se4 at wavelengths between 0.9 and 1.3 µm are reported. In the paramagnetic state, the rotation passes a minimum with decreasing wavelength and changes sign at the absorption edge. The Verdet constant is proportional to the paramagnetic susceptibility (V = −18 deg/kOe-cm at 300°K and λ = 1.05 µm). In the ferromagnetic state the Faraday effect is large and the sign reversal very pronounced; e.g., the rotation changes by 6.5 × 104 deg/cm in a wavelength interval of 400 Å in saturated material at 93°K. The photon energy at which the sign reversal occurs shows a strong temperature-dependent red shift; the temperature dependence is similar to that of the absorption edge. At low temperatures an additional rotational minimum appears that is subject to the same red shift.
Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.
IBM Journal of Research and Development
Date of Publication:
- ISSN :
- Date of Current Version :
06 April 2010
- Issue Date :
- Sponsored by :