The bonding distances between atoms in five different structure types of superconductors, Nb3Sn, (La, Sr)2CuO4, YBa2Cu3O7–δ, Bi2Sr2CaCu2Ox and Tl2Ca2Ba2Cu3O8+x were calculated. There are many shrunken bonds in all the five compounds. Tc increases with the decrease in atomic distance of cations, rather than that of Cu–O. Structures which have large rhombicity tends to have higher density without the application of ultra‐high pressure owing to the existence of a large number of oxygen; that is, the more the number of oxygen anions surrounding the cations increases, the more the radii of cations shrink. In shrunken atoms, electron orbits are forced to condense toward to the nucleus, it is considered that superconducting electrons are apparently created and perfect diamagnetism is derived from inner filled bands.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics