Photoinduced Self-Localized Structural Distortions in YBa2Cu3O7-delta: Direct Evidence of Polarons or Bipolarons

Abstract

Photoinduced infrared absorption measurements of YBa2Cu307-delta (delta=0.75) in the spectral region from 150/cm to 4000 cm are reported. We observed photoinduced infrared active vibrations (IRAV) modes, associated phonon bleachings, and an electronic transition (from a localized gap state) peaked at 1050/cm (0.13 eV). The spectral features indicate a local tetragonal to orthorhombic distortion in the Cu-O plane around the photoinduced charge carriers in YBa2Cu307-delta is smaller than La2CuO4. The photoinduced structural distortion and the associated self-localized gap state demonstrate that the photoexcitations are relatively long lived polarons or bipolarons.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1988
Accession Number
ADA196091

Entities

People

  • A. J. Heeger
  • C. F. Foster
  • G. Stucky
  • S. Cox
  • Yong Hwan Kim

Organizations

  • University of California, Santa Barbara

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Charge Carriers
  • Chemical Reactions
  • Crystal Lattices
  • Crystal Structure
  • Crystals
  • Diffusion
  • Diffusion Coefficient
  • Electrical Conductivity
  • Grain Boundaries
  • Heat Of Activation
  • High Temperature
  • Materials
  • Metal Oxides
  • Oxides
  • Point Defects
  • Semiconductors
  • Transition Metals

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Superconducting Magnet Technology

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene