Fluctuational superconductivity of magnetic systems

The fluctuational theory of superconductivity predicted the existence of high-temperature superconductivity in compounds of rare-earth metals, in ceramic systems, and polymers before its experimental discovery by Bednorz and Muller. The theory is based on the enhancement of conductivity by fluctuations in the electron spin that arise due to the exchange nature of electron-phonon interactions. Methods of increasing the critical temperature of high-temperature superconductors are proposed. Macroscopic properties of high-temperature superconductors are investigated both in the superconducting and normal phases by using the theory of gauge fields, differential geometry, and topology