MAGNETIZATION MEASUREMENTS OF CLUSTERS OF MN(II) AT LOW-TEMPERATURE AND HIGH MAGNETIC-FIELD

The compound under study is a magnetic metal oxyde cluster of Mn(II) e ncapsulated in between two polyoxymetalate clusters PW9O34, i.e. (Mn-4 (H2O)(2)(PW9O34)(2))K(10)20H(2)O. We measured the magnetization up to 36 T in a large range of temperature (0.06-4.2K) and we observed steps due to the crossing of the spin states. We compared these results wit h the energy spectrum predicted from inelastic neutron scattering and magnetic measurements. Such magnetization measurements under high puls ed field and at very low temperature are performed for the first time.