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We investigate a mixture of ultracold fermionic $^{40}$K atoms and weaklybound $^{6}$Li$^{40}$K dimers on the repulsive side of a heteronuclear atomicFeshbach resonance. By radio-frequency spectroscopy we demonstrate that thenormally repulsive atom-dimer interaction is turned into a strong attraction.The phenomenon can be understood as a three-body effect in which two heavy$^{40}$K fermions exchange the light $^{6}$Li atom, leading to attraction inodd partial-wave channels (mainly p-wave). Our observations show that massimbalance in a fermionic system can profoundly change the character ofinteractions as compared to the well-established mass-balanced case.

Observation of a Strong Atom-Dimer Attraction in a Mass-Imbalanced Fermi-Fermi Mixture