Direct evaporative cooling of 41K into a Bose-Einstein condensate
Abstract
We have investigated the collisional properties of 41K atoms at ultracold temperature. To show the possibility to use 41K as a coolant, a Bose-Einstein condensate of 41K atoms in the stretched state (F=2, mF=2) was created for the first time by direct evaporation in a magnetic trap. An upper bound of three body loss coefficient for atoms in the condensate was determined to be 4(2) 10-29 cm -6 s-1. A Feshbach resonance in the F=1, mF=-1 state was observed at 51.42(5) G, which is in good agreement with theoretical prediction.
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