Springer Online Journal Archives 1860-2000
Electrical Engineering, Measurement and Control Technology
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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