  We use electromagnetically induced transparency (EIT) laser cooling to cool
motional modes of a linear ion chain. As a demonstration, we apply EIT cooling
on $^{24}Mg^+$ ions to cool the axial modes of a $^9Be^+$ - $^{24}Mg^+$ ion
pair and a $^9Be^+$ - $^{24}Mg^+$ - $^{24}Mg^+$ - $^9Be^+$ ion chain, thereby
sympathetically cooling the $^{9}$Be$^{+}$ ions. Compared to previous
implementations of conventional Raman sideband cooling, we achieve
approximately an order-of-magnitude reduction in the duration required to cool
the modes to near the ground state and significant reduction in required laser
intensity.
