Field-driven magnetisation steps in Ca3Co2O6: A single-crystal neutron-diffraction study C. L. Fleck, M. R. Lees, S. Agrestini, G. J. McIntyre and O. A. Petrenko EPL, 90 6 (2010) 67006 Published online: 13 July 2010 DOI: 10.1209/0295-5075/90/67006