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Three-dimensional magnetic properties of Bi2CuO4

Magnetic susceptibility and neutron diffraction measurements prove the 3D rather than the 2D or 1D character of magnetic interactions in Bi2CuO4. It has been shown that, at TN=44.6+or-0.3 K, Bi2CuO4 undergoes a transition to an antiferromagnetic state. The magnetic unit cell coincides with the chemical cell (k=0) and is of type I. The value of magnetic moment is either (0.53+or-0.1) mu B or (0.75+or-0.1) mu B depending on whether the magnetic moments are oriented parallel or perpendicular, respectively, to the c axis. The effective magnetic moment of the Cu2+ ion is (1.80+or-0.2) mu B. The results of theoretical susceptibility calculations for the BCT lattice model and for the SQ lattice model together with the molecular-field interactions have been presented and compared with the experiment.