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Energy levels of Co2+ in CoF2 and CsCoCl3

Neutron scattering measurements have been made of the high-energy excitonic excitations of Co2+ ions in CoF2 and CsCoCl3. The measurements were performed with the HET direct geometry time-of-flight spectrometer on the ISIS pulsed neutron source at the Rutherford Appleton Laboratory. In the case of CoF2 the results are consistent with previous estimates of the crystal-field and spin-orbit parameters, but for CsCoCl3 there are marked discrepancies. The results can be fitted by adjusting the crystal-field parameters, but this has the consequence that the exchange interactions between the spins in CsCoCl3 are anisotropic.