**Author details**

Olga V. Molodtsova1 , Alexander N. Chaika2 \* and Victor Yu. Aristov1,2

1 Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany

2 Institute of Solid State Physics of the Russian Academy of Sciences, Russian Federation

\*Address all correspondence to: chaika@issp.ac.ru

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
