Light scattering by magnons in Bi2CuO4 single crystals

The polarized Raman scattering spectra of Bi2CuO4 single crystals were measured at temperatures between 10 and 300 K. In addition to the Raman-active phonon modes, two new structures at 14 and 150 cm-1 appear at temperatures below 50 K. These modes, which are assigned as one- and two-magnon modes, have Eg symmetry and Eg and B1g symmetry, respectively. Their temperature dependences agree well with previous results of antiferromagnetic resonance experiments.