Explanation

It is also called superconductor critical temperature. For the type I superconductor, the resistance of some elements and compounds suddenly disappears at a specific temperature. We define the temperature at which the resistance suddenly disappears as the superconducting transition temperature. For type II superconductor, the transition from normal state to superconducting state, that is, the process of resistance dropping to zero, is completed within a limited temperature interval, which we call transformation broadband, and its size depends on the purity of materials, the integrity of crystal, and the stress state inside the sample. For type II superconductor, the superconducting transition temperature can be divided into initial superconducting transition temperature, intermediate superconducting transition temperature and zero resistance temperature. The initial superconducting transition temperature refers to the initial temperature when the superconductor enters the mixed state from the normal state. According to the BCS theory, the superconducting transition temperature can also be referred to as the temperature at which Cooper electron pairs are disassembled.

Classification