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- W2034989774 abstract "Using the Dyson-Maleev representation of the spin opertors, the two-magnon Raman spectra (${mathit{B}}_{1mathit{g}}$ geometry) in quasi-two-dimensional Heisenberg antiferromagnets at finite temperatures are calculated. The two-magnon spectrum is computed in a self-consistent manner within the framework of a renormalized harmonic approximation, which is correct up to order 1/S in the 1/S expansion of perturbation theory. Including a renormalization of the one-magnon spectral function due to the intrinsic spin part of the model up to order 1/${mathit{S}}^{2}$ and due to spin-phonon interaction up to order 1/S, it is shown that spin-phonon interaction generates a significant broadening of the one-magnon spectral function at the Brillouin-zone boundary in the regime where sound velocities are small compared to magnon velocities. In that regime it dominates the spectral feature of the two-magnon Raman line. Based on that result, the anomalous broadening of the two-magnon spectrum, observed in light-scattering experiments on antiferromagnets with large maximum magnon energies such as, e.g., the spin-1/2 compound ${mathrm{La}}_{2}$${mathrm{CuO}}_{4}$ and the spin-1 compound ${mathrm{Pr}}_{2}$${mathrm{NiO}}_{4}$, can be described mainly as a consequence of spin-phonon interaction. This effect is absent in systems with smaller exchange integrals such as, e.g., ${mathrm{La}}_{2}$${mathrm{NiO}}_{4}$ or ${mathrm{K}}_{2}$${mathrm{NiF}}_{4}$, respectively. Accordingly, it is safe to postulate that the broad spectral feature observed experimentally is generated by spin-phonon interaction. In order to explain the line shape in the cuprates completely, especially the high-energy tail, four-magnon contributions due to nearest-neighbors spin-pair excitations and higher contributions in the effective Raman-scattering Hamiltonian due to the resonant enhancement of the Raman cross section have to be considered and will be discussed on a qualitative basis." @default.
- W2034989774 created "2016-06-24" @default.
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- W2034989774 date "1995-07-01" @default.
- W2034989774 modified "2023-10-16" @default.
- W2034989774 title "Effect of spin-phonon interaction on the Raman spectra of quasi-two-dimensional Heisenberg antiferromagnets" @default.
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- W2034989774 doi "https://doi.org/10.1103/physrevb.52.1025" @default.
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