Abstract
Spectral measurements of the Voigt birefringence Δn were performed for the cubic magnetic semiconductor Cd1−x Mn x Te (0≤x≤0.52) in order to investigate how the exchange interaction of Mn2+ ions with itinerant electrons depends on the electron wave vector. It was determined that Δn/x 2 is independent of x and the magnetic field direction, i.e., the effect is due to the Mn2+ ions and is isotropic. Below the band gap edge the dispersion of the birefringence Δn can be described well in all samples by the unusual dependence Δn∼(E g −ℏω) −3.5. This can be explained by a decrease of the exchange interaction of Mn2+ ions with itinerant electrons with increasing distance from the center of the Brillouin zone.
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Pis’ma Zh. Éksp. Teor. Fiz. 67, No. 8, 569–573 (25 April 1998)
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Krichevtsov, B.B., Pisarev, R.V., Rzhevskii, A.A. et al. Dispersion of the Voigt effect in the magnetic semiconductors Cd1−x MnxTe. Jetp Lett. 67, 602–606 (1998). https://doi.org/10.1134/1.567733
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DOI: https://doi.org/10.1134/1.567733