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Spin superfluid is a novel emerging quantum matter arising from theBose-Einstein condensate (BEC) of spin-1 bosons. We demonstrate the spinsuperfluid ground state in canted antiferromagnetic Cr2O3 thin film at lowtemperatures via nonlocal spin transport. A large enhancement of the nonlocalspin signal is observed below ~ 20 K, and it saturates from ~ 5 K down to 2 K.We show that the spins can propagate over very long distances (~ 20 micrometers) in such spin superfluid ground state and the nonlocal spin signaldecreases very slowly as the spacing increases with an inverse relationship,which is consistent with theoretical prediction. Furthermore, spinsuperfluidity has been investigated in the canted antiferromagnetic phase ofthe (11-20)-oriented Cr2O3 film, where the magnetic field dependence of theassociated critical temperature follows a two-thirds power law near thecritical point. The experimental demonstration of the spin superfluid groundstate in canted antiferromagnet will be extremely important for the fundamentalphysics on the BEC of spin-1 bosons and paves the way for future spinsupercurrent devices, such as spin-Josephson junctions.

Experimental Signatures of Spin Superfluid Ground State in Canted Antiferromagnet Cr2O3 via Nonlocal Spin Transport