Electron-phonon interactions in superconducting La1.84Sr0.16CuO4 films.
We have measured quasiparticle tunneling across a junction perpendicular to the superconducting copper oxide planes. The tunneling spectra show peaks in the density of states. There are 11 minima in the second derivative d2I/dV2, where I is the current and V the voltage, suggesting multiple boson-quasiparticle interactions. These minima match precisely with the published Raman scattering data, leading us to conclude that the relevant bosons in superconducting La1.84Sr0.16CuO4 films are phonons.
Shim
Heejae
H
Brookhaven National Laboratory, Upton, New York 11973, USA.
Chaudhari
P
P
Logvenov
Gennady
G
Bozovic
Ivan
I