1. New Chemistry Unit Jawaharlal Nehru Centre for Advanced Scientific Research Jakkur Bangalore Karnataka 560064 India
2. International Centre for Materials Science Jawaharlal Nehru Centre for Advanced Scientific Research Jakkur Bangalore Karnataka 560064 India
3. School of Advanced Materials Jawaharlal Nehru Centre for Advanced Scientific Research Jakkur Bangalore Karnataka 560064 India
4. Materials Department University of California Santa Barbara Santa Barbara CA 93106‐5050 USA
5. Materials Research Laboratory University of California Santa Barbara Santa Barbara CA 93106‐9530 USA
6. Theoretical Science Unit Jawaharlal Nehru Centre for Advanced Scientific Research Jakkur Bangalore Karnataka 560064 India
7. Physics Department University of California Santa Barbara Santa Barbara CA 93106‐9530 USA
8. UF Chimie Université de Bordeaux Talence F‐33405 France