A Study of Rare Earth Intermetallic Compound La0.73Dy0.27Mn2Si2 by Raman Spectroscopy, Magnetic Force Microscopy, and Resonance Photoemission Spectroscopy

— The features of magnetic microstructure of La 0.73 Dy 0.27 Mn 2 Si 2 at 293 K have been visualized by atomic force and magnetic force microscopy. Magnetic force images reveal the presence of low-contrast magnetic domains. The change of Raman spectral characteristics of light scattering in the process of cooling La 0.73 Dy 0.27 Mn 2 Si 2 to a temperature of 263 K is experimentally detected. The electronic structure of La 0.73 Dy 0.27 Mn 2 Si 2 is investigated by resonance photoemission spectroscopy with the use of the synchrotron radiation. Resonances at the 3 d and 4 d levels of electronic structure show different properties of valence electrons. Using the Dy 3 d –4 f ( M 4.5 absorption edge) resonance, the distribution of 4 f states of dysprosium in the valence band is determined. Photoemission upon the giant Dy 4 d –4 f ( N 4.5 absorption edge) resonance is determined by the contribution of all states in the valence band due to the sudden involvement of the Coulomb interaction. The energies of the 5 p and 4 f levels of La, the 4 f level of Dy, and the 3 d level of Mn in the valence band are determined.