PHONON CONTRIBUTION ON THE HIGH T-C COOPER PAIRING INVESTIGATED BY TUNNELING SPECTROSCOPY

Improved tunneling spectroscopy on BSCCO(2212) single crystal provided certain spectrum of quasiparticles that mediate the strong Cooper pai ring, and it reveals that optical phonons due to the oxygen oscillatio ns in and around the [CuO2] net-plane play a significant role. The elu cidated electron-phonon coupling intensities alpha(2)F(omega) shows an exceeding peak at 72 meV of the breathing mode relating to the charge fluctuations rather than at 35 meV of the B-1g mode which may enhance the spin correlation. Beyond the single phonon energy range h omega(D ), further significant spectrum peaks was observed and their character istic energies were assigned in terms of epsilon(0) = 72 meV as n epsi lon(0) + h omega(ph).