Physics – Condensed Matter – Superconductivity
Scientific paper
2009-01-15
PNAS 2008 105:20161-20166
Physics
Condensed Matter
Superconductivity
26 pages, 7 pages
Scientific paper
10.1073/pnas.0811335106
The mechanism of electron pairing in high-temperature superconductors is still the subject of intense debate. Here, we provide direct evidence of the role of structural dynamics, with selective atomic motions (buckling of copper-oxygen planes), in the anisotropic electronlattice coupling. The transient structures were determined using time-resolved electron diffraction, following carrier excitation with polarized femtosecond heating pulses, and examined for different dopings and temperatures. The deformation amplitude reaches 0.5 % of the c-axis value of 30 A when the light polarization is in the direction of the copper-oxygen bond, but its decay slows down at 45 degrees. These findings suggest a selective dynamical lattice involvement with the anisotropic electron-phonon coupling being on a time scale (1 to 3.5 ps depending on direction) of the same order of magnitude as that of the spin exchange of electron pairing in the high-temperature superconducting phase.
Carbone Fabrizio
Giannini Enrico
Yang De-Shan
Zewail Ahmed H.
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