Finite-wavevector phonon coupling to degenerate electronic states in LaSrCuO

Details Finite-wavevector phonon coupling to degenerate electronic states in LaSrCuO Finite-wavevector phonon coupling to degenerate electronic states in LaSrCuO

2000-07-17

arxiv.org/abs/cond-mat/0007284v1

Physics

Condensed Matter

Superconductivity

8 pages postscript figures are included

Scientific paper

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 E_u and E_g -symmetry O states. Experimentally observed anomalies in inelastic neutron scattering, ESR and EXAFS are found to be consistent with such an interaction of the tau_1 symmetry Sigma point mode with the planar O p_x and p_y states. The proposed interaction is found to naturally facilitate symmetry breaking associated with pairing and/or stripe formation.

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