Hamburg 2001 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

O: Oberflächenphysik

O 13: Postersitzung (Adsorption auf Oberfl
ächen, Oberfl
ächenreaktionen, Elektronische Struktur, Epitaxie und Wachstum, Halbleiteroberfl
ächen und Grenzfl
ächen, Oxide und Isolatoren)

O 13.43: Poster

Montag, 26. März 2001, 19:00–22:00, Foyer zu B

Spectroscopic study of the (La,Ba)(Mn,Co,Ni)O system — •Mihaela Carmen Demeter¹, Manfred Neumann¹, Vladimir Tsurcan², Vadim R. Galakhov³, Ernst Z. Kurmaev³, and I. O. Troyanchuk⁴ — ¹Fachbereich Physik, Universität Osnabrück, Germany — ²Institute of Applied Physics, Academy od Sciences, Chisinau, Moldova — ³Institute of Metal Physics, Russian Academy of Sciences, Ekaterinburg, Russia — ⁴Institute of Physics of Solids and Semiconductors of National Academy of Sciences, Minsk, Belarus

In the last few years a great interest has reappeared in manganese perovskites due to the CMR effect reported for La_1−xA_xMnO₃ (A= Sr, Ba, Ca, Pb). Here we present new experimental results of the doped manganese perovskites La_1−xBa_xMn_1−yCo(Ni)_yO₃, single crystals (x= 0.2 - 0.26, y= 0.12 - 0.22). The electronic structures of these compounds are studied by X-ray photoelectron spectroscopy. The valence band spectra are compared to those of the reference compounds: La_1−xBa_xMnO₃, LaMnO₃ and LaNiO₃. The results are discussed in relation to the X-ray emission spectroscopy, magnetic measurements and the available band structure calculations.