Abstract
Small single ion anisotropy is believed to play an important role in selecting the plane where the spins lie in hexagonal anitferromagnets on the basis of the classical approximation. For instance, in VBr2 a small easy-axis single ion anisotropy is expected to force the spins in a plane containing the c axis and the classical approximation suggests that the spin configuration should be an ‘‘umbrella’’ configuration with axis along the external magnetic field perpendicular to the c axis. However, the classical expectation is questionable because the zero point motion energy supports spin configurations with the spins lying in a plane containing the magnetic field. We find that the ‘‘planar’’ configuration with the spins in the plane containing the c-axis and the external magnetic field is stable for interplane coupling and anisotropy sufficiently small. Since this is the case of VBr2, our results rise some doubts about the interpretation of experimental data in VBr2 when an external magnetic field is applied.
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