Abstract
dc magnetic susceptibility measurements and the torque magnetometry were used toexperimentally probe the symmetry of the antiferromagnetically (AFM) ordered state ofBi2CuO4. A phenomenological approach to the anisotropy energy is used to modelthe angular dependence of torque for easy axis and easy plane anisotropy.Comparison of these results with the experimentally obtained curvesleads to the conclusion that the antiferromagnetically ordered state inBi2CuO4 has an easy planeanisotropy with the c plane as an easy plane. The estimated value of the critical field for the spin-flop in the easy plane isHc≈15–20 kOe giving the easy plane anisotropy energy constantK22≈27–47 × 103 erg mol−1. The resulting antiferromagnetic structure contains two equally populated mutuallyperpendicular AFM domains in zero magnetic field.
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