G. Klinsera, S. Topoloveca, H. Krenb, S. Kollerb, H. Krennc, R. Würschuma

a Institute of Materials Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria
b VARTA Micro Innovation GmbH, Stremayrgasse 9, 8010 Graz, Austria
c Institute of Physics, University of Graz, Universitätsplatz 5, 8010 Graz, Austria

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