Abstract
FOR the ion Eu3+, in which the multiplet intervals are not very great compared to kT, Van Vleck1 gives theoretical magnetic susceptibilities which are almost independent of temperature below 80° K. The actual values depend on the screening constant, and extrapolation2 from the known levels of Sm3+ suggests that the screening constant, σ, for the Eu3+ ion should be 33. If this is correct, then the theoretical susceptibilities are as represented in the accompanying graph. Susceptibilities calculated for σ = 34 fire also shown.
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References
Van Vleck, J. H., “Theory of Electric and Magnetic Susceptibilities” (Oxford Univ. Press, 1932).
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TRAPNELL, B., SELWOOD, P. Magnetic Susceptibilities of Europium Sesquioxide and of Uranium Dioxide at Low Temperatures. Nature 169, 840–841 (1952). https://doi.org/10.1038/169840a0
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DOI: https://doi.org/10.1038/169840a0
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