Superconducting materials are a class of special materials whose electrical resistance completely disappears and which exhibit perfect diamagnetism (Meissner effect) when the temperature drops below a certain critical value. In other words, when the material reaches below its critical temperature (Tc), it can achieve zero-resistance current transmission without energy loss. This phenomenon not only allows current to circulate infinitely in the wire without decay, but also enables the material to repel external magnetic fields, suspending itself above a magnet and forming a quantum locking effect.
Superconducting materials can be classified into conventional low-temperature superconductors and high-temperature superconductors based on their critical temperature and physical mechanism. Conventional superconductors are usually metals or metal alloys, such as lead (Pb) and niobium-tin (Nb3Sn), with low critical temperatures, mostly below 20K, requiring liquid helium cooling. High-temperature superconductors are mainly copper oxides or iron-based compounds, such as YBCO and BSCCO, with critical temperatures reaching the liquid nitrogen temperature range (around 77K), facilitating more economical cooling and applications.
Superconducting materials have wide applications in modern science and technology, including high-efficiency power transmission, strong magnetic field levitation trains, magnetic resonance imaging (MRI), quantum computing, and particle accelerators. Due to their zero resistance and diamagnetic properties, superconducting materials can significantly reduce energy consumption, improve equipment performance, and drive the development of high-precision technologies.
