PHOTOCONDUCTIVITY AND PHOTOMAGNETIC EFFECT IN EPITAXIAL MNXHG1-XTE LAYERS AT LOW-TEMPERATURES

The spectra, temperature dependence, and field dependence of the photo magnetic effect, the photoconductivity, and the Hall coefficient RH ha ve been measured in epitaxial Mn(x) Hg1-xTe/CdTe films (x=0.09-0.012). The films were grown by liquid-phase epitaxy. A structural feature of R(H) in the temperature region 20-125 K is explained in a two-layer m odel. An anomalous photomagnetic effect has been observed. It is linke d with a varigap nature of the epitaxial layers near the heterojunctio n. At liquid-helium temperature, 4.2 K, the photomagnetic effect is do minated by a heating component, which oscillates in a magnetic field. The data on the photoconductivity reveal the temperature dependence of the carrier lifetime in the epitaxial layers over the temperature ran ge 4.2-290 K.