One-magnon Raman scattering in La(2)CuO(4): the origin of the field-induced mode

Details One-magnon Raman scattering in La(2)CuO(4): the origin of the field-induced mode One-magnon Raman scattering in La(2)CuO(4): the origin of the field-induced mode

2005-07-05

arxiv.org/abs/cond-mat/0507103v2

Phys. Rev. B 72, (R)140401 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.72.140401

We investigate the one-magnon Raman scattering in the layered antiferromagnetic La(2)CuO(4) compound. We find that the Raman signal is composed by two one-magnon peaks: one in the B1g channel, corresponding to the Dzyaloshinskii-Moryia (DM) mode, and another in the B3g 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 field-induced mode (FIM) signals the existence of a new magnetic state above the Neel temperature T_N, where the direction of the weak-ferromagnetic moment (WFM) lies within the CuO(2) planes.

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