Physics – Condensed Matter – Superconductivity
Scientific paper
2001-02-13
Nature 412, 510-514 (2001)
Physics
Condensed Matter
Superconductivity
14 pages, 4 figures
Scientific paper
10.1038/35087518
Coupling between electrons and phonons (lattice vibrations) drives the formation of the electron pairs responsible for conventional superconductivity. The lack of direct evidence for electron-phonon coupling in the electron dynamics of the high transition temperature superconductors has driven an intensive search for an alternative mechanism. A coupling of an electron with a phonon would result in an abrupt change of its velocity and scattering rate near the phonon energy. Here we use angle resolved photoemission spectroscopy to probe electron dynamics -velocity and scattering rate- for three different families of copper oxide superconductors. We see in all of these materials an abrupt change of electron velocity at 50-80meV, which we cannot explain by any known process other than to invoke coupling with the phonons associated with the movement of the oxygen atoms. This suggests that electron-phonon coupling strongly influences the electron dynamics in the high-temperature superconductors, and must therefore be included in any microscopic theory of superconductivity.
Bogdanov P. V.
Eisaki Hiroshi
Feng D. L.
Fujimori Atsushi
Hussain Zahid
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