Direct Role of Structural Dynamics in Electron-Lattice Coupling of Superconducting Cuprates - Condensed Matter > SuperconductivityReportar como inadecuado




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Abstract: The mechanism of electron pairing in high-temperature superconductors isstill the subject of intense debate. Here, we provide direct evidence of therole of structural dynamics, with selective atomic motions buckling ofcopper-oxygen planes, in the anisotropic electronlattice coupling. Thetransient structures were determined using time-resolved electron diffraction,following carrier excitation with polarized femtosecond heating pulses, andexamined for different dopings and temperatures. The deformation amplitudereaches 0.5 % of the c-axis value of 30 A when the light polarization is in thedirection of the copper-oxygen bond, but its decay slows down at 45 degrees.These findings suggest a selective dynamical lattice involvement with theanisotropic electron-phonon coupling being on a time scale 1 to 3.5 psdepending on direction of the same order of magnitude as that of the spinexchange of electron pairing in the high-temperature superconducting phase.



Autor: F. Carbone, D.-S. Yang, E. Giannini, A.H. Zewail

Fuente: https://arxiv.org/







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