1. Department of Physics, Institute of Physics, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary
2. Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, Augsburg 86159, Germany
3. Institute of Technical Physics and Materials Science, HUN-REN Centre for Energy Research, Konkoly-Thege M. út 29-33, 1121 Budapest, Hungary
4. HUN-REN-BME Condensed Matter Research Group, Műegyetem rkp. 3, H-1111 Budapest, Hungary
5. Institute of Electromagnetic Fields, ETH Zurich, Gloriastrasse 35, 8092 Zürich, Switzerland