YBCO, or Yttrium Barium Copper Oxide, is a high-temperature superconductor with the chemical formula YBa$_2$Cu$_3$O$_{7-x}$. It is known for its ability to conduct electricity without resistance at temperatures much higher than traditional superconductors, specifically above the boiling point of liquid nitrogen (77 K). This material plays a significant role in the study of high-temperature superconductivity and showcases unique magnetic properties, including the Meissner effect.
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