Effect of electron-phonon interactions on Raman line at ferromagnetic   ordering
  The theory of Raman scattering in half-metals by optical phonons interacting with conduction electrons is developed. We evaluate the effect of electron-phonon interactions at ferromagnetic ordering in terms of the Boltzmann equation for carriers. The chemical potential is found to decrease with temperature decreasing. Both the linewidth and frequency shift exhibit a dependence on temperature. 
L.A. Falkovsky
cond-mat.mtrl-sci cond-mat.mes-hall