ANISOTROPY OF G-FACTOR OF CU2+ ION AND ANISOTROPIC EXCHANGE INTERACTION BETWEEN SPINS IN ANTIFERROMAGNETIC BI2CUO4

To study the anisotropy of g-factor of Cu2+ ion in the antiferromagnet ic Bi2CuO4 having an interesting crystal structure, we calculate the e nergy splitting of the orbital state of Cu2+ ion due to the electric c rystalline field arising from the surrounding O2-, B3+ and Cu2+ ions. On the basis of Pryce's spin Hamiltonian we evaluate g-tensor of each CU2+ ion in the unit cell. We also discuss the anisotropic exchange in teraction which is important as the origin of the anisotropy energy fo r Cu2+ ion with S=1/2. The results are discussed in connection with ob servations.