Münster 1999 – wissenschaftliches Programm

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O: Oberflächenphysik

O 11: Poster (I)

O 11.49: Poster

Montag, 22. März 1999, 19:30–22:30, Aula

Investigation of the La-Mn-O system by XPS and XES — •M. Demeter¹, V. R. Galakhov², E. Z. Kurmaev², N. I. Labachevskaya², and M. Neumann¹ — ¹Fachbereich Physik, Universität Osnabrück, Barbarastra"sse 7, 49069 Osnbrück — ²Institute of Metal Physics, Russian Academy of Sciences - Ural Division, 620219 Yekaterinburg GSP -170, Russia

We have studied the electronic structure of the perovskite manganese oxides, La_1−xBa_xMnO₃ and LaMnO₃ by X-ray Photoelectron Spectroscopy (XPS) and X-ray Emission Spectroscopy (XES). The Mn 3d and O 2p electronic state distribution is established. The strong hybridization between the Mn 3d and O 2p states is observed. It is found that the Mn 3d (e_g↓) states are localised near the Fermi level and they appeared in the XPS measurements as a well pronounced peak. It was established that the nonstoichiometry in LaMnO_3+δ samples is determined by defects in the metals positions. The Mn 3s spectra for all compounds are analysed and the high-spin electron configuration is found. The experimental results are compared with the band structure calculations.