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The static magnetic susceptibility of ultrafine Mg particles with various diameters of less than 10 nm has been measured in the temperature range from 2 to 240 K. We show for the first time that the temperature-independent paramagnetism is enhanced for smaller particles relative to bulk materials. This finding is compatible with the recent study on Os multinuclear cluster compounds that revealed a size-dependent paramagnetic enchancement. The coexistence of the quantum size effect and the enhancement of paramagnetism has also been observed at low temperatures.
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Kimura et al. (1987) studied this question.
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