Affiliation: | aLaboratory of Crystallography, ETH-Hönggerberg HCI G512, CH-8093 Zürich, Switzerland bLaboratoire Léon Brillouin, (CEA-CNRS) Saclay, 91191 Gif sur Yvette Cedex, France cVan der Waals-Zeeman Institute, University of Amsterdam, NL-1018 XE, Amsterdam dESRF, BP 220, F-38043 Grenoble Cedex, France |