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The term supercurrent relates to a macroscopic dissipation-free collectivemotion of a quantum condensate and is commonly associated with such famouslow-temperature phenomena as superconductivity and superfluidity. Another typeof motion of quantum condensates is second sound - a wave of the density of acondensate. Recently, we reported on an enhanced decay of a parametricallyinduced Bose-Einstein condensate (BEC) of magnons caused by a supercurrentoutflow of the BEC phase from the locally heated area of a room temperaturemagnetic film. Here, we present the direct experimental observation of along-distance spin transport in such a system. The condensed magnons beingpushed out from the potential well within the heated area form a density wave,which propagates through the BEC many hundreds of micrometers in the form of aspecific second sound pulse - Bogoliubov waves - and is reflected from thesample edge. The discovery of the long distance supercurrent transport in themagnon BEC further advances the frontier of the physics of quasiparticles andallows for the application of related transport phenomena for low-loss datatransfer in perspective magnon spintronics devices.

Long-distance supercurrent transport in a room-temperature Bose-Einstein magnon condensate