  Raman spectra of La$_{2-x}$Sr$_x$CuO$_4$ are similar to those of
Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ except for the split two-magnon peaks at the
stripe phase and the stronger step-like decrease in the low energy $B_{\rm 2g}$
spectra. The suppressed $B_{\rm 1g}$ spectral region below the two-magnon peak
decreases as the carrier density increases, whereas the energy of the step-like
suppression is little dependent on the carrier density. It suggests the
anisotropic charge transfer mechanism coupled with magnetic excitations along
the nearest neighbor Cu sites and the phononic excitations along the diagonal
direction.
