Abstract
The effects of the anisotropic exchange interactions on the magnetic ordered states, the magnetization and the magnetic susceptibility of the singlet ground state system of spin one and with a uniaxial anisotropic D -term are investigated by the molecular field theory in the vicinity of the level crossing field H ≃ D / g µ B . It is shown that the induced ordered state without the transverse component of magnetization appears in a certain range of magnetic field as the spin dimensionality decreases. It has also turned out that the phase transition between this ordered state and the canted antiferromagnetic state ordinarily found for the isotropic singlet ground state system is of the first order.
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