Abstract
THE principal magnetic susceptibilities of crystalline copper sulphate (CuSO4.5H2O) have been measured from room temperature down to about 90° K.1. From a detailed analysis of these magnetic data, Jordahl2 finds that they can be explained quantitatively on the assumption that the crystalline electric field in the neighbourhood of the Cu+ + ion in the crystal is predominantly cubic in symmetry, with a small tetragonal component superposed on it. The ground state of the Cu+ + ion is2D, and the crystalline field postulated is such that under the influence of its cubic part the energy levels split up into two sets, the lower set having a two-fold orbital degeneracy, and the upper a three-fold one, the separation between the two sets being about 18,300 cm.-1; the tetragonal part of the field separates the levels of either set by about 2,550 cm.-1. Each of these separated levels will have a two-fold spin degeneracy, which, being of the Kramers type, will not be removed by the crystalline field.
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