MAGNETIC EXCITATIONS AND THE CURIE-TEMPERATURE OF DECAMETHYLCHROMOCENIUM TETRACYANOETHYLENIDE

We describe the molecular ferromagnet decamethylchromocenium tetracyan oethanide [CrCp2[TCNE] by a quasi-one-dimensional alternating-spin mo del with ferromagnetic exchange interaction. The spin-wave theory is u sed to discuss the magnetic excitation of the molecular ferromagnet. W e obtain the magnetizations corresponding to different external magnet ic fields without interchain exchange interaction which is consistent with the experimental results. The formula of the Curie temperature T- c is obtained by using the thermodynamic Green's function method. It i s found to be related to the spin of donors, to the intrachain exchang e interaction and to the spatial anisotropic parameter. The result obt ained by this T-C formula is consistent with the experimental result T -C = 3.6 K for [CrCp2][TCNE].