Surface Raman scattering of the light in antiferromagnetic chromium

Abstract

Raman scattering of light from the plane surface of antiferromagnetic chromium is discussed in terms of conventional second-order time-dependent perturbation theory. The scattering efficiency as a function of frequency and temperature is calculated from the scattering of light by one-electron, one-hole, and electron-hole pair excitations. It is shown that the unphysical divergence of the scattering cross section for the photon energy transfer equal to twice the antiferromagnetic energy gap found by Kwok, Woo, and Jha is removed by taking properly into account the statistical coherence factors.