Abstract
A new method of measurement of the magnetic susceptibility of substances in a broad range of temperatures is described, which is based on the compensation (nulling) of an external magnetic field and a non-mechanical detection of the secondary magnetic field of a sample using Hall sensors. It is shown that, in copper acetate monohydrate, the Bleaney-Bowers model is valid and the antiferromagnetic exchange interactions are retained at elevated temperatures. The temperature variation of the magnetic susceptibility of copper oxides (CuO, Cu2O) measured in a range from 25 to 900°C reveals a nonlinear increase in the diamagnetic response and is accompanied by a characteristic IR luminescence, which is suggested to be of an exciton nature.
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