1. Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Street 8, 420088 Kazan, Russian Federation
2. Leibniz Institute for Solid State and Materials Research IFW Dresden, Helmholtzstraße 20, 01069 Dresden, Germany
3. Institute of Theoretical Physics, TU Bergakademie Freiberg, Leipziger Street 23, D-09599 Freiberg, Germany