Abstract
Firstly, a brief review is given on recent theoretical developments made by our group as to the many-body effect including electronic structure of hole-doped cuprates. Then the mechanism of superconductivity is discussed on the basis of the above-mentioned electronic structure of LSCO. In doing so we present the results of quantitative calculation of the electron phonon coupling constants and the k , k ′ dependence of the spectral function α 2 F ( Ω, k , k ′) made on the basis of the renormalized one-electron-type band. The following important results emerge from this calculation: (1) d-wave pairing occurs even for the phonon mechanism, provided the localized spins form a local antiferromagnetie order: (2) phonon modes in which oxygen ions move vertically for CuO 2 plane contribute to the electron phonon interaction in cuprates while those like breathing modes in which oxygen and copper ions vibrate within a CuO 2 plane do not contribute significantly: (3) the electron phonon interaction in CuO 5 pyramid-type cuprates is stronger than CuO 6 octahedral-type cuprates.
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