Open AccessSUPERCONDUCTIVITY MECHANISM OF NON-CUPRATE SUPERCONDUCTORS
Author(s) -
Chengtao Yu,
Bin Chen,
Guiqin He
Publication year - 1994
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.43.1152
Subject(s) - pairing , superconductivity , physics , superexchange , condensed matter physics , cuprate , hubbard model , hamiltonian (control theory) , coordinate space , quantum mechanics , antiferromagnetism , mathematical optimization , mathematics , geometry
Based on the singly occupied a-picture and the mechanism of charge fluctuation, the effective Hamiltonian of two-band Hubbard model is derived by using the degeneracy perturbation theory for the non-cuprate comoound 1-xx3. By considering the next neighbour pairing of two opposite spin holes in coordinate space, the Green's function equation of motion and superconductivity equation are obtained. Furthermore, how the superexchange interaction and the hopping energy affect the next neighbour pairing has been explained reasonably, and the superconductivity window is due to the Cooper pairing in coordinate space.