Physics – Condensed Matter – Superconductivity
Scientific paper
2009-04-08
Physical Review B 79, 184512 (2009)
Physics
Condensed Matter
Superconductivity
Accepted for publication in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.79.184512
We take advantage of the connection between the free carrier optical conductivity and the glue function in the normal state, to reconstruct from the infrared optical conductivity the glue-spectrum of ten different high-Tc cuprates revealing a robust peak in the 50-60 meV range and a broad con- tinuum at higher energies for all measured charge carrier concentrations and temperatures up to 290 K. We observe that the strong coupling formalism accounts fully for the known strong temperature dependence of the optical spectra of the high Tc cuprates, except for strongly underdoped samples. We observe a correlation between the doping trend of the experimental glue spectra and the critical temperature. The data obtained on the overdoped side of the phase diagram conclusively excludes the electron-phonon coupling as the main source of superconducting pairing.
der Marel Dirk van
Eisaki Hiroshi
Greven Martin
Heumen Erik van
Kuzmenko Alexey B.
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