1. Center for Materials for Information Technology The University of Alabama Tuscaloosa AL 35487 USA
2. Department of Physics The University of Alabama Tuscaloosa AL 35487 USA
3. International Centre for Materials Science Chemistry and Physics of Materials Unit Jawaharlal Nehru Centre for Advanced Scientific Research Bangalore 560064 India
4. Leibniz Institute for Crystal Growth Max‐Born‐Str. 2 12489 Berlin Germany