High Temperature SuperconductorsCeramic materials are expected to be insulators -- certainly not superconductors, but that is just what Georg Bednorz and Alex Muller found when they studied the conductivity of a lanthanum-barium-copper oxide ceramic in 1986. Its critical temperature of 30 K was the highest which had been measured to date, but their discovery started a surge of activity which discovered superconducting behavior as high as 125 K. ![]()
|
Index Superconductivity concepts Reference Rohlf,Ch 15 See also June 91 issue of Physics Today ( 7 articles). | ||
|
Go Back |
Cuprate Superconductor PhasesIllustrative of the complexity of the high-temperature superconductor materials is this phase diagram which applies to the cuprate materials. At very low doping, they show the long range order of an antiferromagnet. ![]() Doping breaks up the antiferromagnetic order and they become insulators. Only with doping fraction between about 0.1 and 0.2 do they become superconductors. |
Index Superconductivity concepts Reference Batloggin Physics Today, 1991 | ||
|
Go Back |
|
Index Superconductivity concepts Reference Rohlf,Ch 15 | |||
|
Go Back |
Energy Gap in Superconductors as a Function of Temperature
|
Index Superconductivity concepts Reference Blatt,Ch 13 | ||
|
Go Back |
Vanadium Heat Capacity
|
Index Superconductivity concepts Reference Rohlf,Ch 15 | ||
|
Go Back |
Exponential Heat Capacity
|
Index Superconductivity concepts Reference Rohlf,Ch 15 | |||
|
Go Back |