Although the low frequency electronic Raman response in the superconducting state of the cuprates can be largely understood in terms of a d-wave energy gap, a long standing problem has been an explanation for the spectra observed in the $A_{ 1g}$ polarization orientations. We present calculations which suggest that the peak position of the observed $A_{ 1g}$ spectra is due to a collective spin fluctuation mode.
Categories: cond-mat.supr-con