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Yttrium barium copper oxide (YBCO) is a family of crystalline chemical compounds that display high-temperature superconductivity; it includes the first material ever discovered to become superconducting above the boiling point of liquid nitrogen [77 K (−196.2 °C; −321.1 °F)] at about 93 K (−180.2 °C; −292.3 °F).
YBCO films deposited directly on metal substrate materials exhibit poor superconducting properties. It was demonstrated that a c-axis oriented yttria-stabilized zirconia (YSZ) intermediate layer on a metal substrate can yield YBCO films of higher quality, which had still one to two orders less critical current density than that produced on the ...
The most famous ReBCO is yttrium barium copper oxide, YBa 2 Cu 3 O 7−x (or Y123), the first superconductor found with a critical temperature above the boiling point of liquid nitrogen. [10] Its molar ratio is 1 to 2 to 3 for yttrium, barium, and copper and it has a unit cell consisting of subunits, which is the typical structure of perovskites .
YBCO: Cuprate 95 120–250 II no EuBCO Cuprate 93 II no [46] GdBCO Cuprate 91 II no [47] BSCCO: Cuprate 104 HBCCO Cuprate 135 HgTlBaCaCuO Cuprate 164 II [citation needed] SmFeAs(O,F) Iron-based 55 CeFeAs(O,F) Iron-based 41 LaFeAs(O,F) Iron-based 26 LaFeSiH Iron-based 11 [48] LaFePO Iron-based 4 FeSe:SrTiO 3: Iron-based 60-100 (Ba,K)Fe2As2 Iron ...
For example, YBCO and BSCCO can alternatively be referred to as Y123 and Bi2201/Bi2212/Bi2223 depending on the number of layers in each superconducting block (n). The superconducting transition temperature has been found to peak at an optimal doping value (p=0.16) and an optimal number of layers in each superconducting block, typically n=3.
Also in 2018, researchers noted a possible superconducting phase at 260 K (−13 °C) in lanthanum decahydride (LaH 10) at elevated (200 GPa) pressure. [11] In 2019, the material with the highest accepted superconducting temperature was highly pressurized lanthanum decahydride, whose transition temperature is approximately 250 K (−23 °C). [1 ...
For example, YBCO and BSCCO can alternatively be referred to as "Y123" and Bi2201/Bi2212/Bi2223 depending on the number of layers in each superconducting block (n). The superconducting transition temperature has been found to peak at an optimal doping value ( p =0.16) and an optimal number of layers in each superconducting block, typically n =3.
Other type-II examples are the cuprate-perovskite ceramic materials which have achieved the highest superconducting critical temperatures. These include La 1.85 Ba 0.15 CuO 4, BSCCO, and YBCO (Yttrium-Barium-Copper-Oxide), which is famous as the first material to achieve superconductivity above the boiling point of liquid nitrogen (77 K).