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High-energy spin and charge excitations in La2CuO4.

  • Author(s): Lyons, KB
  • Sulewski, PE
  • Fleury, PA
  • Carter, HL
  • Cooper, AS
  • Espinosa, GP
  • Fisk, Z
  • Cheong, S
  • et al.
Abstract

Inelastic light scattering studies of La2CuO4, both pure and doped with lead, over the energy range 01 have revealed the presence of high-frequency A1g scattering components, in the spectral region 35006000 cm-1, while also providing the complete line shape for the previously reported spin-pair mode of B1g symmetry. Two main bands, broad and overlapping, are observed in this region with maxima near 3500 and 5200 cm-1. The various spectral features show different resonance behavior. We suggest that a model based upon coupled spin and charge excitations will be required to describe these spectra. © 1989 The American Physical Society.

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