Abstract
The understanding of Transition metal (Mn) impurity on semiconductingsurface have opened a wide scope of investigation based on the localstructure, hybridization effect, electronic properties and magneticordering occurring on the surface/interface of the system. The preparedsurface/ interface has been probed in-situ by X-ray photoemission (XPS),X-ray absorption (XAS) and the resonant photoemission (ResPES)spectroscopies along with the parameterized configuration integration (CI)models to calculate the Mn spectral weight in core-level and valence bandphotoemission. Presence of electron correlation has been evident by anintermediate state in the process of photoemission channel. Change of thelineshape due to the transition from an overall N – 1 electron final state(RRAS channel) to an N -2 electron final state (normal Auger channel) isevidenced by the analysis of the experimental data, which also allowed theratio to be tracked between charge delocalization and core-hole timescales as the photon energy is tuned across the Mn L3 edge [1].This can beused as an analysis technique for presence of electron correlation intransition metal based inorganic system. In addition to this, angleresolved photoemission spectroscopy (ARUPS),a powerful technique has beendone for experimental band mapping to detect the evolution of surfacestates below the Fermi energy or Mn derived state crossing the Fermi edgeof the Mn:Ge(111) sample [2]; as compared to the calculated band structureby Density functional theory using LDA[4]. In the second section adescription will be given on the cation diffusion and hybridizationeffects at the Mn-GaSe(0001) interface probed by soft X-ray electronspectroscopies[3]. In all the above systems, magnetic properties have beenrevealed as characterized by SQUID magnetometer.References1. Tracking the excitation dynamics in the Mn:Ge(111) metallic interface by resonant electron spectroscopy, L. Sangaletti, *S. Dash*, A. Verdini , L. Floreano, A. Goldoni, G. Drera, S. Pagliara, A. Morgante, J. Phys.: Condens. Matter 24 (2012) 2355022. Angle resolved UV Photoemission study on Mn:Ge (111) surface, *S. Dash*, L Sangaletti, L petaccia et. al. in preparation3. Cation diffusion and hybridization effects at the Mn-GaSe(0001) interface, *S. Dash*, G. Drera, E. Magnano, F. Bondino, P. Galinetto, M.C. Mozzati, V. Aguekian, and L. Sangaletti to be submitted4. First-principles characterization of ferromagnetic Mn5Ge3 for spintronic applications, S. Picozzi and A. Continenza, A. J. Freeman
