As far as I know, there are no confirmed superconductors that operate at room temperature. When superconductivity was first discovered, it was at temperatures just barely above absolute zero (-273 Celsius). These temperatures could only be achieved using liquid helium. Over the years, other materials were found, and the next big milestone when superconductivity could be achieved at 77 K or higher, since 77 K is the temperature of liquid nitrogen (much more available and cheaper than liquid helium). I think since then, superconductivity can be achieved at temperatures around 125 K. A few years ago, I remember hearing reports of room temperature superconductivity on materials composed of nanotubes, but I'm not sure those have ever been successfully substantiated.
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