Photoemission spectroscopy of half-metallic manganese compounds: perovskite versus Heusler

Abstract

We have investigated the electronic structures of the Mn-based half-metallic ferromagnetic systems of Pr1-xSrxMnO3 (PSMO) and PtMnSb Heusler compound, using photoemission spectroscopy. The partial spectral weight (PSW) distributions of Mn 3d, Pr 4f. and Pt 5d electrons have been determined and compared to the LSDA band structure calculations. The overall features of the Mn 3d PSWs of PtMnSb and PSMO are found to be very similar, except for the region near E-F. The reduced spectral intensity at E-F in the Mn 3d PSW of PSMO suggests the localized nature of the Mn e(g) electrons in PSMO due to the lattice polaron formation. (C) 2000 Elsevier Science B.V. All rights reserved.