Electronic Raman scattering studies of strongly correlated electron systems

Raman scattering, especially electronic Raman scattering, is briefly reviewed and introduced as a research tool for studying strongly correlated electron systems. Since the Ramau scattering process directly couples to electronic, lattice, and spin degrees of freedom, it is especially suited for probing excitations of various origins and the correlations among them. Through Raman scattering measurements, one can get energy, lifetime, and symmetry information on the excitations. The results of Raman scattering studies of EuB6 and rare-earth-doped rnauganese oxides are presented as examples, and the implication of the results is briefly discussed.