Chemistry and high temperature superconductivity
Abstract
Seven distinct families of superconductors with critical temperatures at ambient pressure that equal or surpass the historic 23 K limit for Nb3Ge have been discovered in the last 25 years. Each family is reviewed briefly and their common chemical features are discussed. High temperature superconductors are distinguished by having a high (≥50%) content of nonmetallic elements and fall into two broad classes. ‘Metal–