The forming factors of high values of superconducting transition temperature Tc in 3d-transition metal compounds I. The main groups of known superconductors

Abstract

The review of modern known groups of superconductors is presented. The main classification rule is the type of chemical bonding. The factors of forming superconducting transition temperature are impurities and the external pressure.Keywords: High-temperature Superconductors, Metals, Ceramics Experimentally found [1] that the resistance of materials to electric current at a certain temperature jump decreases to zero and materials become superconductors. In a weak magnetic field, the superconductor is diamagnetic.Transition temperature to the superconducting state is called the critical temperature T c . The temperature range at which this phase transition occurs, is