Realization of degenerate ²³Na⁴⁰K molecules

We report on the generation of 60000 degenerate and long-lived ²³Na⁴⁰K Feshbach molecules at a temperature of 0.3 times the Fermi temperature. We use a species-dependent dipole trap to selectively compress a degenerate Fermi gas of K and match its density to a Bose-Einstein condensate of Na. By ramping the magnetic field across a Feshbach resonance, we are able to associate more than 60% of the bosons into weakly-bound Feshbach molecules. After the association, during which no loss is observed, the Feshbach molecules are transferred into the rovibrational ground-state by Stimulated Raman Adiabatic Passage.