Abstract
Using a single crystal from which nonstoichiometries have been removed, the principal susceptibilities, and , of CoO have been determined in the temperature range of 4.2 to 350 K, bracketing K. A stress ≃ 210 bars along [001] was applied during measurements and in cooling through (to remove domains), and the initial was measured for and at Oe. These measured 's are then related to and using the known magnetic structure of CoO, from which and at various temperatures are determined. Then, using the relation , the calculated (powder) is found to agree well with the measured at all temperatures, thus providing a consistency check on the procedures used in this work. For K, the experimental /g. This value is about 50% higher than the only available theoretical estimate by Tachiki [although his estimates of (0) and are in good agreement with our measured values]. Various sources for this discrepancy are examined, and it is suggested that further theoretical work is needed to explain this discrepancy as well as the observed temperature dependence of and . A comparison with the recent results of a similar study in MnO is also made.
- Received 3 March 1981
DOI:https://doi.org/10.1103/PhysRevB.24.419
©1981 American Physical Society