The thallium superconducting family is the largest family of high temperature superconductors. And can be divided into two sub groups. The first group of molecular formula Tl2Ba2Can-1CunO2n+4, n=1,2,3.... The family has three main members, the 2201 phase, the 2212 phase and the 2223 phase. The superconducting transition temperature of the 2201 phase (Tl2Ba2CuO6) is 90K, the superconducting transition temperature of the 2212 phase (Tl2Ba2CaCu2O8) is 110K. The superconducting transition temperature of the 2223 phase (Tl2Ba2Ca2Cu3O10) is 125K. Each member of this family has two Tl atoms in its molecular formula, which corresponds to two thallium atoms on the crystal structure, so it is called the.
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