Raman studies of charge-transfer insulating cuprates

  • Liu R
  • Klein M
  • Salamon D
 et al. 
  • 5

    Readers

    Mendeley users who have this article in their library.
  • 24

    Citations

    Citations of this article.

Abstract

We have studied the electronic interband excitations in insulating cuprates using both resonant and ordinary Raman techniques. The resonant behaviors of two-magnon and two-LO(Eu) phonon Raman scattering in YBa2Cu3O6, Pr2CuO4and Gd2CuO4with the charge-transfer band (1.7-2.7 eV) are found to be dramatically different. The phonon-pair scattering resonates strongly with the strong 1.7 eV peak at the optical absorption edge. The magnon-pair Raman scattering vanishes there, resonating at 2.7 eV, indicating perhaps that this denotes the strongest singlet interband transition. High energy Raman scattering allowed us to reveal, for the first time, dipole forbidden interband excitations. A well-defined peak at 1.5 eV for YBa2Cu3O6and Gd2CuO4has an unusual pseudovector A2gsymmetry, indicating its magnetic character. © 1993.

Author-supplied keywords

  • Raman scattering
  • charge-transfer excitation
  • two-magnon
  • two-phonon

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

  • Ran Liu

  • M. V. Klein

  • D. Salamon

  • S. L. Cooper

  • W. C. Lee

  • S. W. Cheong

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free