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We investigate the one-magnon Raman scattering in the layeredantiferromagnetic La(2)CuO(4) compound. We find that the Raman signal iscomposed by two one-magnon peaks: one in the B1g channel, corresponding to theDzyaloshinskii-Moryia (DM) mode, and another in the B3g channel, correspondingto the XY mode. Furthermore, we show that a peak corresponding to the XY modecan be induced in the planar (RR) geometry when a magnetic field is appliedalong the easy axis for the sublattice magnetization. The appearance of suchfield-induced mode (FIM) signals the existence of a new magnetic state abovethe Neel temperature T_N, where the direction of the weak-ferromagnetic moment(WFM) lies within the CuO(2) planes.Comment: 4 pages, 3 figure

physical review. b, condensed matter and materials physics

One-magnon Raman scattering in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">La</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>: The origin of the field-induced mode

One-magnon Raman scattering inLa2CuO4: The origin of the field-induced mode