Magnetic properties of Cr-doped 6H-SiC single crystals

6H-SiC single crystals doped in Cr at doses of 0.0156 wt% were prepared in a stainless steel autoclave at 460 °C. The doped samples were characterized with Raman spectroscopy (RS), X-ray fluorescence spectrum (XFS), electronic paramagnetism resonance (EPR) and superconducting quantum interference device (SQUID) measuring their magnetic properties. Room temperature paramagnetism of the 6H-SiC single crystals due to Cr3+ was examined by EPR spectra, with the fine structure parameter g=1.99g=1.99. To the sensitivity of SQUID analysis, signatures of ferromagnetism were observed in the samples at low temperatures, with an apparent Curie temperature of 69.8 K.