Ultracold Heteronuclear Fermi-Fermi Molecules
  We report on the first creation of ultracold bosonic heteronuclear molecules of two fermionic species, 6Li and 40K, by a magnetic field sweep across an interspecies s-wave Feshbach resonance. This allows us to associate up to 4x10^4 molecules with high efficiencies of up to 50%. Using direct imaging of the molecules, we measure increased lifetimes of the molecules close to resonance of more than 100 ms in the molecule-atom mixture stored in a harmonic trap. 
A.-C. Voigt, M. Taglieber, L. Costa, T. Aoki, W. Wieser, T.W. H\"ansch   and K. Dieckmann