Special features of electron spin resonance in 4H-SiC in the vicinity of the insulator-metal phase transition:: I.: Effects of spin interaction

Special features of electron spin resonance in the vicinity of the insulator-metal phase transition in n-type 4H-SiC:N were investigated. It was shown that, in the insulating state, an antiferromagnetic phase of the spin-glass type is formed in this region. As a result, with increasing doping level, the content of the paramagnetic phase decreases, and, at an impurity concentration close to critical (corresponding to the transition), the resonance line of nitrogen atoms disappears. Instead of it, a line of deep-level impurity centers is observed at the same position in the metallic state. In addition, two new lines are observed in the metallic state in strong fields; these lines are attributed to free charge carriers. (C) 2003 MAIK "Nauka/Interperiodica".