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Local magnetic moments in a dinuclear Co2+ complex as seen by polarized neutron diffraction:Beyond the effective spin-1/2 model  


Ana Borta, Béatrice Gillon, Arsen Gukasov, Alain Cousson, Dominique Luneau, Erwann Jeanneau, Iurii Ciumacov, Hiroshi Sakiyama, Katsuya Tone, and Masahiro Mikuriya

Polarized neutron diffraction investigations of a paramagnetic molecular dinuclear Co2+ complex, using the local site susceptibility method, show that the Co2+ ions carry opposite magnetic moments of 3.1(1) and 3.2(1) μB, making an angle of 37(1)° which is in agreement with the value (39°) provided by the theoretical analysis of the magnetic susceptibility using the model of effective spin ½. Polarized neutron diffraction (PND) shows that this dinuclear Co2+ complex behaves more like a system of two antiferromagnetically coupled ions with spin 3/2, the directions of which are imposed by the distortion axis of the octahedra around each Co2+ ion due to ligand field. This first application of the local susceptibility tensor method to a molecular compound demonstrates the efficiency of the PND method as a tool for exploring magnetic anisotropy in molecular paramagnets.


http://dx.doi.org/10.1103/PhysRevB.83.18 ...

A. Menelle, 2012-02-04 00:00:00


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