Ferromagnetic phase transition and Bose-Einstein condensation in spinor Bose gases

Details Ferromagnetic phase transition and Bose-Einstein condensation in spinor Bose gases Ferromagnetic phase transition and Bose-Einstein condensation in spinor Bose gases

2003-07-02

arxiv.org/abs/cond-mat/0307063v1

Phy. Rev. A 68, 031604(R) (2003)

Physics

Condensed Matter

4 pages, 4 figures

Scientific paper

10.1103/PhysRevA.68.031604

Phase transitions in spinor Bose gases with ferromagnetic (FM) couplings are studied via mean-field theory. We show that an infinitesimal value of the coupling can induce a FM phase transition at a finite temperature always above the critical temperature of Bose-Einstein condensation. This contrasts sharply with the case of Fermi gases, in which the Stoner coupling $I_s$ can not lead to a FM phase transition unless it is larger than a threshold value $I_0$. The FM coupling also increases the critical temperatures of both the ferromagnetic transition and the Bose-Einstein condensation.

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