Dicyanamide Magnets
Collinear Ferromagnetism and Spin Orientation in the Molecule-based magnets M[N(CN)2]2 (M = Co, Ni)
, C. R. Kmety, J. L. Manson, Q. Huang, J. W. Lynn, R. W. Erwin, J. S. Miller, A. J. Epstein, Phys. Rev. B 60, 60-63 (1999).Abstract
Zero-field unpolarized neutron powder diffraction has been used to study the low-T magnetic structure and T-dependent crystal structure of M[N(CN)2]2 (M = Co, Ni). Both compounds show collinear ferromagnetism with spin orientation along the c axis. The results provide the determination of a complete magnetic structure in the ordered state for a molecule-based magnet. The c lattice parameter exhibits negative thermal expansion, explained by a wine-rack-like deformation.