Possible Observation of a Spin-Density Wave in La2CuO4 by Raman Scattering.

摘要

The multipeaked Raman spectrum in samples of La2CuO4 in the region from 300 to 1420/cm is modeled. We report a striking example of such a spectrum from room temperature to 500 K in a single-crystal sample. An explanation of the spectrum is proposed based on the allowed excitation of spin-wave modes in the presence of a spin-density wave. The role of the dynamic spin-correlation length in broadening the spin-wave spectrum and in affecting the temperature and sample dependence of the spectrum is also discussed. Keywords: Spin resonance. (jes)