While the macroscopic phenomenon of superconductivity is well known and in practical use worldwide, the current theoretical paradigm for superconductivity suffers from a number of limitations. For example, there is no currently accepted theoretical explanation for the pattern of superconductor critical temperatures in the periodic table. Historical
Introduction. Pattern of Elemental Superconductors in the Periodic Table. High-Temperature Superconductors, Tc > 77 K: Electron Spin in Superconductors. Heat Capacity and Magnetic Susceptibility in Superconductors. Quantum Foundations of Molecular Electricity and Magnetism. Metals and Insulators. Electron Transport in Metals. Magnetoresistance. Quantum Hall Effect. Type I Superconductivity. Type II Superconductivity. Conclusions.