Abstract
Magnetic susceptibility and magnetization data are reported for the organic-inorganic composite material phenyl-MnPO4. The phenyl groups are situated between MnPO4 layers. The MnO46− octahedra of these layers form a quasi 2D square lattice. Two-dimensional magnetism has been observed above TN=13.8 (1) K, θCW=53 (1) K. Weak ferromagnetism is observed below TN. An ac-magnetic susceptibility study showed two peaks around TN, which indicates that the magnetic ordering process takes place in two steps. The magnetic susceptibility data indicate the presence of a reorientational structural phase transition around Tph=250 K.
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