title: Quantum-degenerate mixture of fermionic lithium and bosonic rubidium gases.
abstract: We report on the observation of sympathetic cooling of a cloud of fermionic 6Li atoms which are thermally coupled to evaporatively cooled bosonic 87Rb. Using this technique we obtain a mixture of quantum-degenerate gases, where the Rb cloud is colder than the critical temperature for Bose-Einstein condensation and the Li cloud is colder than the Fermi temperature. From measurements of the thermalization velocity we estimate the interspecies s-wave triplet scattering length |amx|=20(+9)(-6)aB. We found that the presence of residual rubidium atoms in the |2, 1> and the |1, -1> Zeeman substates gives rise to important losses due to inelastic collisions.
authors.affiliation: Physikalisches Institut, Eberhard-Karls-Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Silber
authors.forename: S
authors.initials: S
authors.lastname: Günther
authors.forename: C
authors.initials: C
authors.lastname: Marzok
authors.forename: B
authors.initials: B
authors.lastname: Deh
authors.forename: Ph W
authors.initials: PW
authors.lastname: Courteille
authors.forename: C
authors.initials: C
authors.lastname: Zimmermann