Abstract
The electronic spectrum and temperature dependence of the magnetic susceptibility of powdered KAlCuF 6 is reported and shown to be consistent with the compressed tetragonal geometry of the CuF 6 4- groups in this compound. Angular overlap bonding parameters are derived and used to estimate the magnetic coupling between the Cu 2+ ions, which are linked in chains via the axial fluoride ligands. Good agreement is obtained with the observed exchange coupling constant J=-60 cm -1 , and it is shown that this coupling is expected to be strongly dependent on the CuFCu bridging angle
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