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• W2041693709 abstract "The nature of superconductivity in simple metals is well understood, but standard theory fails to explain key properties of the high-temperature copper-oxide superconductors. Inelastic neutron scattering measurements now reveal unconventional behaviour of the lattice vibrations in copper-oxide superconductors, resulting in extensive electron-phonon coupling. This favours a model in which carriers bunch up to form rivers of charge — a so-called ‘stripe’ phase — though their contribution to the superconducting state is unclear. Inelastic scattering measurements reveal a strong electron-lattice coupling in copper oxide superconductors — which goes against conventional theory and suggests that that electron–lattice coupling is associated with charge inhomogeneity. The attempt to understand copper oxide superconductors is complicated by the presence of multiple strong interactions in these systems. Many believe that antiferromagnetism is important for superconductivity, but there has been renewed interest in the possible role of electron–lattice coupling1,2,3,4. The conventional superconductor MgB2 has a very strong electron–lattice coupling, involving a particular vibrational mode (phonon) that was predicted by standard theory and confirmed quantitatively by experiment5. Here we present inelastic scattering measurements that show a similarly strong anomaly in the Cu–O bond-stretching phonon in the copper oxide superconductors La2-xSrxCuO4 (with x = 0.07, 0.15). Conventional theory does not predict such behaviour. The anomaly is strongest in La1.875Ba0.125CuO4 and La1.48Nd0.4Sr0.12CuO4, compounds that exhibit spatially modulated charge and magnetic order, often called stripe order6; it occurs at a wave vector corresponding to the charge order. These results suggest that this giant electron–phonon anomaly, which is absent in undoped and over-doped non-superconductors, is associated with charge inhomogeneity. It follows that electron–phonon coupling may be important to our understanding of superconductivity, although its contribution is likely to be indirect." @default.
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• W2041693709 date "2006-04-01" @default.
• W2041693709 modified "2023-10-18" @default.
• W2041693709 title "Electron–phonon coupling reflecting dynamic charge inhomogeneity in copper oxide superconductors" @default.
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• W2041693709 doi "https://doi.org/10.1038/nature04704" @default.
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