Phys. Rev. Lett. 89, 150403 (2002) [4 pages]Fermi-Bose Quantum Degenerate 40K-87Rb Mixture with Attractive InteractionReceived 1 May 2002; published 23 September 2002 We report on the achievement of simultaneous quantum degeneracy in a mixed gas of fermionic 40K and bosonic 87Rb. Potassium is cooled to 0.3 times the Fermi temperature by means of an efficient thermalization with evaporatively cooled rubidium. Direct measurement of the collisional cross-section confirms a large interspecies attraction. This interaction is shown to affect the expansion of the Bose-Einstein condensate released from the magnetic trap, where it is immersed in the Fermi sea. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.150403
DOI:
10.1103/PhysRevLett.89.150403
PACS:
05.30.Fk, 05.30.Jp, 32.80.Pj
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