Accession Number:

ADA196091

Title:

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

Descriptive Note:

Technical memo.

Corporate Author:

CALIFORNIA UNIV SANTA BARBARA DEPT OF CHEMISTRY

Report Date:

1988-05-01

Pagination or Media Count:

48.0

Abstract:

Photoinduced infrared absorption measurements of YBa2Cu307-delta delta0.75 in the spectral region from 150cm 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 1050cm 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.

Subject Categories:

  • Non-acoustic and Non-magnetic Submarine Detection
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE