1. European Synchrotron Radiation Facility, 71 Avenue des Martyrs, 38000 Grenoble, France
2. Laboratory of Quantum Magnetism, Institute of Physics, École Polytechnique Federale de Lausanne, Lausanne CH-1015, Switzerland
3. Institute of General and Ecological Chemistry, Lodz University of Technology, Żeromskiego 116, 90-924 Łódź, Poland