Yttrium barium copper oxide
![](/Images/godic/202501/05/YBCO_high_temperature_superconductor0645.JPG")
![Part of the lattice structure of yttrium barium copper oxide](/Images/godic/202501/05/Ybco002.svg0645.png")
![Like all superconductors, YBCO displays the Meissner effect. Below its critical temperature, YBCO becomes perfectly diamagnetic and excludes sufficiently weak magnetic fields from passing through it.[4]](/Images/godic/202501/05/-Flyingsuperconductor.ogg0645.jpg")
![YBCO superconductor in TTÜ.](/Images/godic/202501/05/YBCO_superconductor0645.JPG")
Yttrium barium copper oxide (YBCO) is a family of crystalline chemical compounds, famous for displaying "high-temperature superconductivity". It includes the first material ever discovered to become superconducting above the boiling point of liquid nitrogen (77 K) at about 90 K. Many YBCO compounds have the general formula YBa2Cu3O7-x (also known as Y123), although materials with other Y:Ba:Cu ratios exist, such as YBa2Cu4Oy (Y124) or Y2Ba4Cu7Oy (Y247).