Magnetic dynamics of La2CuO4 and La2-xBaxCuO4.
作者： G. Aeppli , S. M. Hayden , H. A. Mook , Z. Fisk , S.-W. Cheong
DOI: 10.1103/PHYSREVLETT.62.2052
关键词:
摘要: High-energy inelastic neutron scattering is used to resolve spin waves in La/sub 2/CuO/sub 4/. The corresponding long-wavelength velocity 0.85 +- 0.03 eV A, well above previous bounds set by thermal scattering. Within experimental error, conventional spin-wave theory gives an excellent description of the magnetic dynamics for momentum and energy transfers below 0.15 A/sup -1/ 0.1 eV, respectively. Doping with Ba changes dynamics; data indicate a combination softening damping effects.
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