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VOLUME 20 (1974) | ISSUE 3 | PAGE 191
Anomalies of the photoconductivity in the region of the Curie point of the compound CdCr2Se4 weakly doped with gallium
We have investigated the photoconductivity of the single-crystal semiconductors Cdi^Gaj-C^Se, (x =0.007 and χ =0.01) as a function of the temperature and of the magnetic field. A minimum of the photocurrent and a maximum of the negative photomagnetoresistance was observed in the region of the Curie temperature. Three possible causes of these extrema are suggested: 1) capture of the photoelectrons by magnetic polarons in the region of the Curie point; 2) scattering of the photoelectrons by magnetic polarons; 3) spin-disordered scattering of the photoelectrons in the region of the Curie point.