Abstract
IN a salt of the iron group, though the spin angular momentum of the paramagnetic ion is not directly affected by the crystalline electric fields acting on the ion, yet indirectly it is, owing to its coupling with the orbital angular momentum of the ion, which is easily affected by these fields. The magnetic anisotropy of the crystal, and the deviations of the temperature dependence of its principal susceptibilities from the Curie law, are the results of such an indirect influence of the crystal fields on the spin angular momentum exerted through the spin-orbit coupling1, and should be the greater the stronger the coupling. Conversely, from the observed anisotropy or the deviations from the Curie law, it should be possible to calculate the strength of the spin-orbit coupling in the ion.
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References
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KRISHNAN, K., BOSE, A. Coupling between the Orbital and the Spin Angular Momenta of Paramagnetic Ions from Magnetic Measurements. Nature 141, 329 (1938). https://doi.org/10.1038/141329a0
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DOI: https://doi.org/10.1038/141329a0
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