Room-temperature ferromagnetism in diluted magnetic semiconductor Pb1-xCrxTe

The temperature and magnetic field dependencies of magnetization (T=5-340 K, B <= 0.5 T) as well as electron paramagnetic resonance (EPR) (T=80-400 K) in Pb1-xCrxTe (x <= 0.045) have been studied. It was shown that all samples are ferromagnetic with a clear hysteresis loop up to the room temperature and magnetic saturation moment rises with increasing of the chromium content. Using temperature dependencies of magnetization M(T) ferromagnetic Curie temperatures up to 330 K were revealed. EPR spectra in the paramagnetic phase were satisfactory approximated by a single Dysonian line. Temperature dependence of magnetic susceptibility was estimated and paramagnetic Curie temperature was determined. In ferromagnetic phase pronounced distortion and splitting of the EPR spectra on two Dysonian lines were revealed. Using approximation by the Lorenz-type curves with Dysonian terms, temperature dependencies of the main parameters for each absorption line were obtained.