A theory of superconductivity in cuprates

Condensed Matter Physics

关键词: high-temperature superconductivity;    strong electron correlations;    Hubbard model;    antiferromagnetic exchange interaction;    spin-fluctuations;   

DOI  :  10.5488/CMP.8.4.845

来源: DOAJ

【 摘 要 】

A microscopic theory of superconducting pairing mediated by antiferromagnetic (AFM) exchange and spin-fluctuations is developed within the effective p-d Hubbard model for the CuO₂ plane. It is proved that retardation effects for AFM exchange interaction are unimportant and result in pairing of all electrons in the conduction band and high T_c proportional to the Fermi energy. The spin-fluctuations caused by the kinematic interaction give an additional contribution to the d-wave pairing. T_c dependence on the hole concentration and lattice constants (or pressure) is studied. Small oxygen isotope shift of T_c is explained. The data are compared with the results for the t-J model.

【 授权许可】

Unknown