Abstract
It has been suggested that either the diamagnetism or paramagnetism of Bosegases, due to the charge or spin degrees of freedom respectively, appearssolely to be extraordinarily strong. We investigate the magnetic propertiesof charged spin-1 Bose gases in an external magnetic field, focusing on thecompetition between the diamagnetism and paramagnetism, using the Lande-factorg of particles to evaluate the strength of the paramagnetic effect. We propose that a gas with exhibits diamagnetism at all temperatures, while a gas withg > 1/2 always exhibits paramagnetism. Moreover, a gas with the Lande-factor in between shows ashift from paramagnetism to diamagnetism as the temperature decreases. Theparamagnetic and diamagnetic contributions to the total magnetization density are alsocalculated in order to demonstrate some details of the competition.
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