MULTIBAND DESCRIPTION OF THE ELECTRON-DOPED CUPRATE GAPS ON THE DOPING SCALE

摘要

A model for the description of electron-doped cuprate superconductor excitation gaps on the doping scale is developed. Interband pairing channel is supposed between the defect states (two subbands) created by doping and the upper Hubbard band. Bare gaps between these systems leading to the appearance of pseudogaps close with extended doping. Extincting Hubbard bands supply the defect subsystem. Illustrative calculations for Tom,superconducting gaps, pseudogaps, supercarrier density, thermodynamical critical field and the coherence length are performed on the whole electron-doping scale. Critical dopings correspond to achieved band overlaps. Gross features of the phase diagram of electron-doped materials are reproduced in some analogy with the hole-doping case but in different realization.