Raman Scattering cross section of Spin Ladders
  The Raman scattering spectra from magnetic excitations in an antiferromagnetic spin-1/2 two leg ladder is investigated for weak and strong interladder coupling. In the first case, a cusp in the Raman intensityis obtained at a frequency twice the gap. In the second case, a peak at twice the gap replaces the cusp. We discuss the relevance of our calculation to recent experiments on CaV2O5 and Sr14Cu24O41. 
E. Orignac (1,3), R. Citro (2) ((1) Ecole Normale Superieure, (2)   University of Salerno, (3) Rutgers University)