We present our experimental investigation of the interspecies Feshbach spectrum in a mixture of 167Er(F=19/2,mF=−19/2)-6
Nearby in the stack
Li(
F=1/2,mF=1/2
) atoms in the microkelvin temperature regime. These temperatures are achieved by means of sympathetic cooling with
174
Yb as a third species. Interspecies Feshbach resonances are then identified by investigation of the Er-Li inelastic collisional properties for magnetic fields up to 800 G. Numerous narrow resonances as well as six resonances with widths above 1 G could be identified. It is these broader resonances that hold much promise for interesting future investigations of, for exmample, novel superfluid states and Efimov states in large mass-imbalanced, all-fermionic two-component systems.