Competition between Bose Einstein Condensation and spin dynamics
  We study the impact of spin-exchange collisions on the dynamics of Bose-Einstein condensation, by rapidly cooling a chromium multi-component Bose gas. Despite relatively strong spin-dependent interactions, the critical temperature for Bose-Einstein condensation is reached before the spin-degrees of freedom fully thermalize. The increase in density due to Bose-Einstein condensation then triggers spin dynamics, hampering the formation of condensates in spin excited states. Small metastable spinor condensates are nevertheless produced, and manifest strong spin fluctuations. 
Bruno Naylor, Miroslaw Brewczyk, Mariusz Gajda, Olivier Gorceix,   Etienne Marechal, Laurent Vernac and Bruno Laburthe-Tolra
cond-mat.quant-gas