Biquadratic exchange interaction between Ru5+ ions in (Ru2O9) clusters |
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| Authors: | M Drillon |
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| Institution: | Laboratoire de Chimie du Solide du CNRS, Universitéde Bordeaux I, 351 cours de la Libération, 33405 Talence -Cedex,France |
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| Abstract: | The energy levels of a Ru2O9 cluster have been calculated, including a higher order spin interaction. The Ru5+-Ru5+ coupling is described by the Hamiltonian ?= -2JS1· S2 ?j(S1·S2)2. The temperature dependence of the magnetic susceptibility is used to determine the values of the bilinear J and biquadratic j exchange integrals: J/k = -161K and j/k = 6.6K. The second term in the Hamiltonian corresponds to a fourth order perturbation involving low spin states. |
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