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The temperature dependence of the EPR linewidth in single crystal MnS and MnO have been measured at 35 GHz. The EPR in MnS abruptly stops at 152°±0.5°K as the temperature is decreased. The linewidth in MnS is proportional to (T-TN)−3/8 for 1° ≤ (T-TN) ≤ 6°K. In both MnS and MnO the linewidth is proportional to T/(T-TN) for T-TN > 10°K. In this high-temperature region the constants of proportionality are 80 and 280 Oe, respectively. An applied field of 12 500 Oe does not shift the Néel temperature in MnS.
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J.W. Battles (1971) studied this question.
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