[1] Paul Scherrer Inst, Energy & Environm Res Dept, CH-5232 Villigen, Switzerland
[2] Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland
[3] Univ Fribourg, Dept Phys, Chemin Musee 3, CH-1700 Fribourg, Switzerland
[4] Fribourg Ctr Nanomat, Chemin Musee 3, CH-1700 Fribourg, Switzerland
[5] Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland
[6] Paul Scherrer Inst, Lab Sci Dev & Novel Mat, CH-5232 Villigen, Switzerland
[7] ETH, Inorgan Chem Lab, Dept Chem & Appl Biosci, CH-8093 Zurich, Switzerland