Abstract
The susceptibility of Co${\mathrm{Br}}_{2}$\ifmmode\cdot\else\textperiodcentered\fi{}6${\mathrm{H}}_{2}$O has been measured between 1 and 120 K along all principal axes. The data have been interpreted in terms of the two-dimensional $\mathrm{XY}$ model and its extension to an uniaxial model for the exchange interactions. The influence of the excited doublet states has been accounted for by means of a crystal-field calculation. It is shown that a consistent set of both crystal field and magnetic parameters quantitatively explains the susceptibility for all three principal directions.
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