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 analysis we find that k ≠ 0 phonons can couple to degenerate electronic states in La2− x Sr x CuO4 and a Jahn-Teller-like distortion is found to be operative for E g- and E u-symmetry O states. Experimentally observed anomalies in inelastic neutron scattering, ESR, and EXAFS are found to be consistent with such an interaction of the τ1 symmetry Σ-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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Kabanov, V.V., Mihailovic, D. Finite-Wave-Vector Phonon Coupling to Degenerate Electronic States in La2−xSrxCuO4. Journal of Superconductivity 13, 959–962 (2000). https://doi.org/10.1023/A:1026450207961
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DOI: https://doi.org/10.1023/A:1026450207961