Giant Nonlinear Electron-lattice Interaction in Cuprate Superconductors, and Origin of the Pseudogap

Details Giant Nonlinear Electron-lattice Interaction in Cuprate Superconductors, and Origin of the Pseudogap Giant Nonlinear Electron-lattice Interaction in Cuprate Superconductors, and Origin of the Pseudogap

2009-02-17

arxiv.org/abs/0902.3015v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, with Supplementary material

Scientific paper

The pseudogap is a key property of the cuprate superconductors, whose understanding should illuminate the pairing mechanism. Recent experimental data support a close connection between the pseudogap and an oxygen-driven C4 symmetry breaking within the CuO2 plane unit cell. Using ab initio Molecular Dynamics, we demonstrate the existence of a strong nonlinear electron-oxygen vibrator coupling in two cuprates. In a mean field approach applied to this coupling within a model Hamiltonian, we derive a C4 splitting/pseudogap phase diagram in agreement with experiment - providing an explanation for the pseudogap phenomenon from first principles. The implications for superconductivity and the Fermi surface arc effect are discussed.

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