Affiliation: | 1. Department of Physics, Sri Venkateswara University, Tirupati, 517 502, India;2. Fakultät fürMaschinenbau, Universität Paderborn, Paderborn D-33098, Germany;3. SiC Laboratory, Centre for Materials for Electronics Technology (C-MET), Cherlapally, Hyderabad 500 051, India |