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Magnetic dynamics of La2CuO4 and La2-xBaxCuO4.

  • Author(s): Aeppli, G
  • Hayden, SM
  • Mook, HA
  • Fisk, Z
  • Cheong, S
  • Rytz, D
  • Remeika, JP
  • Espinosa, GP
  • Cooper, AS
  • et al.
Abstract

High-energy inelastic neutron scattering is used to resolve spin waves in La2CuO4. The corresponding long-wavelength velocity is 0.85±0.03 eV AÌ, well above previous bounds set by thermal neutron scattering. Within experimental error, conventional spin-wave theory gives an excellent description of the magnetic dynamics for momentum and energy transfers below 0.15 AÌ-1 and 0.1 eV, respectively. Doping with Ba changes the magnetic dynamics; the data indicate a combination of spin-wave softening and damping effects. © 1989 The American Physical Society.

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