Mechanism of formation and “relay-race” dynamics of Cooper pairs in high-temperature superconductors Free

A theoretical model is proposed, in which oxygen in the lattice of high-temperature superconductors (HTS) exists in the form of an ordinary oxide ion O²⁻, diatomic diamagnetic peroxide ion $O22−$ (the V_k-bicenter), nonstoichiometric molecular oxygen $O20$ freely dissolved in the lattice, and virtual $O2−$⁠. The two electrons on $O22−$ form a bound exciton pair with the two holes of Cu²⁺. The dynamic interaction between pairs is realized through the “relay-race” mechanism in the $O22−−O20$ chain. The motion in the chain induces the motion of a correlated pair of holes in the valence band, which leads to the superconducting current state in HTS. The calculated value of the Bose condensation temperature T_c correlates with experimental values. The linear temperature dependence of resistance, the absence of isotopic effect and the blurring of the superconducting transition in a magnetic field are explained. The existence of antiferroelectricity and a step on the T_c (y) dependence, where y is the nonstoichiometry, are predicted.