2007/03/27 by G. Roati, M. Zaccanti, C. D'Errico +5
Physics and Astronomy · #cond-mat.other #physics.atom-ph
paper · pdf · doi:10.1103/physrevlett.99.010403
published as Phys. Rev. Lett. 99, 010403 (2007) · 5 pages
arxiv created 2007/03/27 · arxiv updated 2009/12/01
We produce a Bose-Einstein condensate of 39-K atoms. Condensation of this species with naturally small and negative scattering length is achieved by a combination of sympathetic cooling with 87-Rb and direct evaporation, exploiting the magnetic tuning of both inter- and intra-species interactions at Feshbach resonances. We explore tunability of the self-interactions by studying the expansion and the stability of the condensate. We find that a 39-K condensate is interesting for future experiments requiring a weakly interacting Bose gas.