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A model Hamiltonian representing the Cu spins in La$_2$CuO$_4$ in itslow-temperature body-centred orthorhombic phase, that includes both spin-orbitgenerated Dzyaloshinskii-Moriya interactions and interplanar exchange, isexamined within the RPA utilizing a Tyablikov decoupling of various high-orderGreen's functions. The magnetic susceptibility is evaluated as a function oftemperature and the parameters quantifying these interactions, and compared torecently obtained experimental data of Lavrov, Ando and collaborators. Aneffective Hamiltonian corresponding to a simple tetragonal structure is shownto reproduce both the magnon spectra and the susceptibility of the morecomplicated body-centred orthorhombic model.Comment: 32 pages, 17 figure

Magnetic susceptibility of the body-centred orthorhombic La2CuO4system

Magnetic susceptibility of the body-centred orthorhombic La₂CuO₄system