Strong off-diagonal polarizability and electron-lattice coupling in high-temperature superconductors

A. Gozar, P. Abbamonte, I. Bozovic

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

High-temperature superconducting (HTS) cuprates are highly anisotropic materials which exhibit metallic-like behavior in the CuO2 planes while retaining dielectric properties in the perpendicular, c-axis, direction. Experimental data show however that in HTS systems the in-plane electronic excitations are strongly coupled to c-axis polarized vibrations. This interaction is manifest in various settings, for example in the resonant Raman profile of phononic excitations, inelastic quasi-particle tunneling, as observation of notch-like features and forbidden scattering for in-plane optical conductivity, colossal c-axis photo-expansion upon in-plane illumination as well as in high-resolution electron energy-loss spectra. We propose that this anisotropic coupling is driven by strong unscreened Coulomb interactions and the preponderance of the Madelung component to the cohesion energy, in particular by the large atomic displacements in the spacer layers induced by charge redistribution within the CuO2 planes.

Original languageEnglish (US)
Title of host publicationOxide-Based Materials and Devices VIII 2017
EditorsFerechteh H. Teherani, David C. Look, David J. Rogers, Ivan Bozovic
PublisherSPIE
ISBN (Electronic)9781510606517
DOIs
StatePublished - 2017
EventOxide-Based Materials and Devices VIII 2017 - San Francisco, United States
Duration: Jan 29 2017Feb 1 2017

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10105
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherOxide-Based Materials and Devices VIII 2017
Country/TerritoryUnited States
CitySan Francisco
Period1/29/172/1/17

Keywords

  • Correlated electronic systems
  • Electron energy loss
  • Electron-phonon coupling
  • High-temperature superconductivity
  • Madelung energy
  • Optical properties
  • Raman scattering
  • Screening
  • X-ray diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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