Abstract
We investigate the one-magnon Raman scattering in the layered antiferromagnetic ${\mathrm{La}}_{2}\mathrm{Cu}{\mathrm{O}}_{4}$ compound. We find that the Raman signal is composed by two one-magnon peaks: one in the ${B}_{1g}$ channel, corresponding to the Dzyaloshinskii-Moryia mode, and another in the ${B}_{3g}$ channel, corresponding to the $XY$ mode. Furthermore, we show that a peak corresponding to the $XY$ mode can be induced in the planar $(RR)$ geometry when a magnetic field is applied along the easy axis for the sublattice magnetization. The appearance of such a field-induced mode signals the existence of a magnetic state above the N\'eel temperature ${T}_{N}$, where the direction of the weak-ferromagnetic moment lies within the $\mathrm{Cu}{\mathrm{O}}_{2}$ planes.
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