Department of Physics, University of Science and Technology Beijing, Beijing 100083, People's Republic of China.
J Phys Condens Matter. 2011 Jan 19;23(2):026003. doi: 10.1088/0953-8984/23/2/026003. Epub 2010 Dec 16.
It has been suggested that either the diamagnetism or paramagnetism of Bose gases, due to the charge or spin degrees of freedom respectively, appears solely to be extraordinarily strong. We investigate the magnetic properties of charged spin-1 Bose gases in an external magnetic field, focusing on the competition between the diamagnetism and paramagnetism, using the Lande-factor g of particles to evaluate the strength of the paramagnetic effect. We propose that a gas with g < 1/√8 exhibits diamagnetism at all temperatures, while a gas with g > 1/2 always exhibits paramagnetism. Moreover, a gas with the Lande-factor in between shows a shift from paramagnetism to diamagnetism as the temperature decreases. The paramagnetic and diamagnetic contributions to the total magnetization density are also calculated in order to demonstrate some details of the competition.
有人认为，玻色气体的抗磁性或顺磁性分别由于电荷或自旋自由度而表现出极强的性质。我们研究了在磁场中带电自旋-1 玻色气体的磁性，重点关注抗磁性和顺磁性之间的竞争，使用粒子的朗德因子 g 来评估顺磁效应的强度。我们提出，g < 1/√8 的气体在所有温度下都表现出抗磁性，而 g > 1/2 的气体总是表现出顺磁性。此外，处于朗德因子之间的气体随着温度的降低从顺磁性转变为抗磁性。为了展示竞争的一些细节，还计算了总磁化密度的顺磁和抗磁贡献。
