1. Physikalisches
Institut, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
2. V.S.
Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences 630090 Novosibirsk, Russia
3. Novosibirsk State University, 630090 Novosibirsk, Russia
4. Saint-Petersburg State University, 198504 Saint-Petersburg, Russia
5. A.
V. Rzanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences 630090 Novosibirsk, Russia
6. Wilhelm
Conrad Röntgen-Center for Complex Material Systems (RCCM), Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany