Phonons, electronic charge response and electron-phonon interaction in the high-temperature superconductors

Abstract

We investigate in the framework of linear response theory the complete phonon dispersion, phonon induced electronic charge response, electron-phonon interaction and dielectric and infrared properties of the high-temperature superconductors (HTSC's). In particular the experimentally observed strong renormalization of the in-plane oxygen bond-stretching modes (OBSM) which appear upon doping in the HTSC's is discussed. It is shown that the characteristic softening, indicating a strong EPI, is most likely a generic effect of the CuO plane and is driven by a nonlocal coupling of the displaced ions to the localized charge-fluctuations (CF's) at the Cu and O ions. The different behaviour of the OBSM during the insulator-metal transition via the underdoped phase is calculated and from a comparison of these modes conclusions about the electronic state in the HTSC's are drawn. The underdoped state is modelled in terms of a charge response which is insulator-like at the Cu and is competing with a metallic charge response at the O-network in the CuO plane. For the non-cuprate HTSC Ba-Bi-O also a strong renormalization of the OBSM is predicted. C-axis polarized infrared and Raman-active modes of the HTSC's are calculated in terms of CF's and anisotropic dipole-fluctuations and the problem of a metallic character of the BiO planes is studied.Interlayer phonons and their accompanying charge response are investigated. Depending on the interlayer coupling calculations are performed from the static, adiabatic- to the non-adiabatic regime.It is shown that phonon-plasmon mixing and a strong long-ranged non-adiabatic EPI becomes evident within a certain region around the c-axis. Both the OBSM and the non-adiabatic coupled c-axis phonon-plasmon modes are found to be important for pairing in the HTSC's.

65 pages,20 figures. Extended version to appear in Physica Status Solidi (b) 2004; figure 20 has been corrected; references have been added

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Cited by in corpus (13)

• Bosonic Spectral Function and The Electron-Phonon Interaction in HTSC Cuprates
• The impact of dynamical screening on the phonon dynamics of LaCuO
• Modeling of the electronic state of the High-Temperature Superconductor LaCuO: Phonon dynamics and charge response
• Observation of polaritons in Bi2Sr2CaCu2O8+x single crystals
• Large momentum-dependence of the main dispersion "kink" in the high-Tc superconductor Bi2Sr2CaCu2O8+δ
• Comparing first-principles density functionals plus corrections for the lattice dynamics of YBa${}_2$Cu${}_3$O${}_6$
• A microscopic modeling of phonon dynamics and charge response in NdCuO
• Microscopic calculation of the phonon dynamics of Sr${}_2$RuO${}_4$ compared with La${}_2$CuO${}_4$
• Phonon dispersion and anomalies in one-layer high-temperature superconductors
• Dynamic charge inhomogenity in cuprate superconductors
• Nonlocal electron-phonon interaction as a source of dynamic charge stripes in the cuprates
• Anomalous bond stretching phonons as a probe of charge fluctuations in perovskites
• A microscopic modeling of phonon dynamics and charge response in metallic BaBiO${}_3$