Abstract
Presented quasiparticle tunneling measurements of superconducting La 1.85Sr 0.15CuO 4 have shown that the fine structures in the second derivative of the tunneling current -d 2 I/d V 2 are strong enough to be observed, and the energy positions of the peaks and valleys in -d 2 I/d V 2 measured from the gap edge of 7 meV correlate with the generalized phonon density of states obtained by inelastic neutron spectroscopy. This fact suggests that phonons participate in the electron-pairing interaction in this superconductor.
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