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Size Effects in Orbital Magnetism

A brief review of magnetic susceptibility measurements on small metallic particles is presented. Many features are poorly understood. Here, the contribution of the orbital motion of the electrons is investigated. Size effects in the orbital magnetic susceptibility studied by considering some simple model systems. The atom-like properties at low temperatures gradually evolve towards a diamagnetism close to the bulk Landau value at high temperatures, with only small size dependent deviations. For k B T smaller than the energy level spacing, the susceptibility of an ensemble average of different particles is expected to show orbital paramagnetism. This mechanism is proposed as an explanation for the observations of Kimura and Bandow [1]. Also, the implications for other experiments are discussed.