Giant electron-phonon anomaly in doped La2CuO4 and other cuprates

Abstract

Since conventional superconductivity is mediated by phonons, their role in the mechanism of high temperature superconductivity has been considered very early after the discovery of the cuprates. The initial consensus was that phonons could not produce transition temperatures near 100K, and the main direction of research focused on nonphononic mechanisms. Subsequent work last reviewed by L. Pintschovius in 2005 showed that electron-phonon coupling in the cuprates is surprisingly strong for some phonons and its role is controversial. Experiments performed since then identified anomalous behavior of certain Cu-O bond-stretching phonons in cuprates as an important phenomenon that is somehow related to the mechanism of superconductivity. A particularly big advance was made in the study of doped La2CuO4. This work is reviewed here.

Review article. To appear in Advances in Condensed Matter Physics, Special Issue: Phonons and Electron Correlations in High-Temperature and Other Novel Superconductors (HTS)

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• Experimental Determination of Momentum-Resolved Electron-Phonon Coupling
• Bosonic Spectral Function and The Electron-Phonon Interaction in HTSC Cuprates
• Phonon anomalies and dynamic stripes
• Isotope effect and bond-stretching phonon anomaly in high-Tc cuprates
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• Large momentum-dependence of the main dispersion "kink" in the high-Tc superconductor Bi2Sr2CaCu2O8+δ
• ARPES Spectral Function in Lightly Doped and Antiferromagnetically Ordered YBa2Cu3O{6+y}
• Inelastic Neutron and X-ray Scattering from Incommensurate Magnetic Systems
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• Low-energy phonons in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ and their possible interaction with electrons measured by inelastic neutron scattering
• Giant two-phonon Raman scattering from nanoscale NbC precipitates in Nb
• Decoupling of Static and Dynamic Charge Correlations revealed by Uniaxial Strain in a Cuprate Superconductor
• The High Temperature Superconductivity in Cuprates: Physics of the Pseudogap Region
• Phonon anomalies with doping in superconducting oxychlorides Ca2-xCuO2Cl2
• New method of soft modes investigation by Little-Parks effect
• Bulk charge density wave and electron-phonon coupling in superconducting copper oxychlorides
• d-Wave Pairing Driven by Bipolaric Modes Related to Giant Electron-Phonon Anomalies in High-$T_c$ Superconductors
• Inelastic neutron scattering study of phonon anomalies in La1.5Sr0.5NiO4
• The influence of phonon symmetry and electronic structure on the electron-phonon coupling momentum dependence in cuprates