Pressure dependence of exchange parameters and Neel temperature in La2CuO4

Microscopic mechanisms responsible for the observed pressure dependencies of the Neel temperature T-N and parameters of isotropic and anisotropic exchange interaction in the orthorhombic antiferromagnet La2CuO4, are investigated. Within the framework of the Anderson microscopic theory of superexchange interaction, the expressions establishing interrelation between parameters of isotropic and anisotropic (both symmetric and antisymmetric) exchange interactions and by the structural parameters describing the C-u-0-C-u bonding angle and the C-u-0 bond length in La2CuO4, are obtained. Experimentally determined pressure dependencies of structural parameters by H. Takahashi et al., allow one to present pressure dependencies of exchange parameters and T-N, in an apparent form.