科研之友
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摘要
The magnetic properties of a charged spin-1 Bose gas with ferromagnetic interactions are investigated within mean-field theory. It is shown that a competition between paramagnetism, diamagnetism and ferromagnetism exists in this system. It is shown that diamagnetism, being concerned with spontaneous magnetization, cannot exceed ferromagnetism in a very weak magnetic field. The critical value of reduced ferromagnetic coupling of the paramagnetic phase to ferromagnetic phase transition (I) over bar (c) increases with increasing temperature. The Lande-factor g is introduced to describe the strength of the paramagnetic effect which comes from the spin degree of freedom. The magnetization density (M) over bar increases monotonically with g for fixed reduced ferromagnetic coupling (I) over bar as (I) over bar > (I) over bar (c). In a weak magnetic field, ferromagnetism makes an immense contribution to the magnetization density. On the other hand, at a high magnetic field, the diamagnetism tends to saturate. Evidence for condensation can be seen in the magnetization density at a weak magnetic field.
- 出版日期2012-9-12
- 单位北京科技大学
