Quasipure Bose-Einstein Condensate Immersed in a Fermi Sea

This is the authors' abstract. We don't add key points for this paper.

We report the observation of coexisting Bose-Einstein condensate (BEC) and Fermi gas in a magnetic trap. With a very small fraction of thermal atoms, the ⁷Li condensate is quasipure and in thermal contact with a ⁶Li Fermi gas. The lowest common temperature is 0.28μK0.2(1)TC0ex0ex=0ex0ex0.2(1)TF where TC is the BEC critical temperature and TF the Fermi temperature. The ⁷Li condensate has a one-dimensional character.