Affiliation: | a Department of Chemistry, The Pennsylvania State University, University Park, PA 16802, USA b Laboratorium voor Vaste-Stoffysica en Magnetisme, Celestijnenlaan 200 D, B-3001 Leuven, Belgium c Institute of Physics, Jagellonian University, ul. Reymonta 4, PL 30-059 Krakow 16, Poland |