Affiliation: | a Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands b Institute of Solid State Physics, Russian Academy of Science, Chernogolovka, Russia c Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8573, Japan d Institut fuer Experimentalphysik, Johannes Kepler Universitaet Linz, A-4040 Linz, Austria e Calipso B.V., P.O. Box 513, 5600 MB Eindhoven, The Netherlands |