Spin correlations in Ca 3 Co 2 O 6 : Polarized-neutron diffraction and Monte Carlo study

Joseph A. M. Paddison,1,2 Stefano Agrestini,3 Martin R. Lees,4 Catherine L. Fleck,4 Pascale P. Deen,5,6 Andrew L. Goodwin,1 J. Ross Stewart,2 and Oleg A. Petrenko4,* 1Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford OX1 3QR, United Kingdom 2ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom 3Max Planck Institute for Chemical Physics of Solids, Nöthnitzerstr. 40, 01187 Dresden, Germany 4Department of Physics, University of Warwick, Coventry, CV4 7AL, United Kingdom 5Institut Laue-Langevin, 6 rue Jules Horowitz, 38042 Grenoble, France 6European Spallation Source, ESS AB, SE-22100 Lund, Sweden (Received 13 December 2013; revised manuscript received 12 May 2014; published 11 July 2014)