H. Kamimura et al., NEW THEORY OF SUPERCONDUCTING COPPER OXIDES - FROM ELECTRONIC-STRUCTURE TO THE D-WAVE PAIRING MECHANISM, Materials science & engineering. B, Solid-state materials for advanced technology, 41(1), 1996, pp. 10-15
Firstly, a brief review is given on recent theoretical developments ma
de by our group as to the many-body effect including electronic struct
ure 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 alpha(2)F(Omega, 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 p
honon mechanism, provided the localized spins form a local antiferroma
gnetic order; (2) phonon modes in which oxygen ions move vertically fo
r CuO2 plane contribute to the electron-phonon interaction in cuprates
while those like breathing modes in which oxygen and copper ions vibr
ate within a CuO2 plane do not contribute significantly; (3) tile elec
tron-phonon interaction in CuO5 pyramid-type cuprates is stronger than
CuO6 octahedral-type cuprates.