Finite-wavevector phonon coupling to degenerate electronic states in LaSrCuO
V. V. Kabanov, D. Mihailovic
Abstract
We consider finite-k electron-phonon coupling appropriate for a superconductor with a very short coherence length and local intersite pairs. From group theoretical analyis we find that phonons with nonzero k can couple to degenerate electronic states in LaSrCuO and a Jahn-Teller-like distortion is found to be operative for Eu and Eg -symmetry O states. Experimentally observed anomalies in inelastic neutron scattering, ESR and EXAFS are found to be consistent with such an interaction of the tau1 symmetry Sigma point mode with the planar O px and py states. The proposed interaction is found to naturally facilitate symmetry breaking associated with pairing and/or stripe formation.
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