Frohlich-interaction induced one-phonon Raman scattering in La2CuO4 using an infrared laser
01 January 1999
The room-temperature Raman scattering from La2CuO4 is measured using a Fourier-transform spectrometer with an infrared laser. Due to the low energy of the laser, neither the two-magnon, nor the two-phonon scattering is observed, but a strong resonant one-phonon scattering is obtained. The seven peak frequencies correspond to longitudinal optic (LO) phonons with both E-u and A(2u) Symmetry. The peaks correspond to phonons approximately halfway across the Brillouin zone, indicating a violation of wavevector conservation. (C) 1999 Elsevier Science Ltd. All rights reserved.