Abstract
It is shown that the direct exchange interaction of ions possessing electrons (holes) with orbital angular momenta L and ℓ always contains a contribution \(V_0 L \cdot \ell + V_1 (L \cdot \hat B)(\hat B \cdot \ell )\), where \(\hat B\) is a unit vector along the bond connecting the ions. As a result, taking the spin-orbit interaction into account gives rise to a pseudodipole interaction of the spins (total angular momenta) of the ions under study and to uniaxial anisotropy. The possibility of using this pseudodipole interaction to explain the magnetic properties of cuprates is discussed.
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Pis’ma Zh. Éksp. Teor. Fiz. 68, No. 1, 67–72 (10 July 1998)