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J. Tapp,1 C. R. dela Cruz,2 M. Bratsch,3 N. E. Amuneke,3 L. Postulka,4 B. Wolf,4 M. Lang,4 H. O. Jeschke,5 R. Valentí,6 P. Lemmens,7 and A. Möller1,* 1Institute for Inorganic Chemistry and Analytical Chemistry, JGU Mainz, Duesbergweg 10-14, 55128 Mainz, Germany 2Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA 3Department of Chemistry, University of Houston, Houston, Texas 77204-5003, USA 4Physikalisches Institut, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany 5Research Institute for Interdisciplinary Science, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan 6Institut für Theoretische Physik, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany 7Institute for Physics of Condensed Matter, TU Braunschweig, Mendelsohnstrasse 3, 38106 Braunschweig, Germany (Received 12 February 2017; revised manuscript received 22 May 2017; published 3 August 2017)