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Trying to dope graphite flakes we found that the magnetization of pure, several tens of micrometers grain size graphite powder and after a simple treatment with pure water shows clear and reproducible granular superconducting behavior with a critical temperature above 300K. The observed magnetic characteristics as a function of temperature, magnetic field and time, provide evidence for weakly coupled grains through Josephson interaction, revealing the existence of superconducting vortices.
Technology Review has coverage.
See more and subscribe to NextBigFuture at 2012-09-12 12:26:48 Source: http://nextbigfuture.com/2012/09/evidence-for-granular-room-temperature.html