Giant Nonlinear Electron-lattice Interaction in Cuprate Superconductors, and Origin of the Pseudogap - Condensed Matter > SuperconductivityReport as inadecuate




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Abstract: The pseudogap is a key property of the cuprate superconductors, whoseunderstanding should illuminate the pairing mechanism. Recent experimental datasupport a close connection between the pseudogap and an oxygen-driven C4symmetry breaking within the CuO2 plane unit cell. Using ab initio MolecularDynamics, we demonstrate the existence of a strong nonlinear electron-oxygenvibrator coupling in two cuprates. In a mean field approach applied to thiscoupling within a model Hamiltonian, we derive a C4 splitting-pseudogap phasediagram in agreement with experiment - providing an explanation for thepseudogap phenomenon from first principles. The implications forsuperconductivity and the Fermi surface arc effect are discussed.



Author: R.A Nistor, G.J. Martyna, M. H. Mueser, D.M. Newns, C.C. Tsuei

Source: https://arxiv.org/







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