Abstract
In order to describe a shoulder peak structure near 4 J in the magnon Raman spectra of undoped high- T c cuprates, we have explored the phonon contribution to the Raman spectra. Incorporating the magnon-phonon Hamiltonian in the spin-wave theory, we have evaluated the two-magnon Raman spectral function originating from the lowest-order magnon-phonon-magnon scattering. It is found that phonons induce a shoulder peak near 4 J besides the dominant two-magnon peak near 3 J, in agreement with experiments.
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