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Author Kurmaev, E. Z. ♦ Korotin, M. A. ♦ Galakhov, V. R. ♦ Finkelstein, L. D. ♦ Zabolotzky, E. I. ♦ Efremova, N. N. ♦ Lobachevskaya, N. I. ♦ Stadler, S. ♦ Ederer, D. L. ♦ Callcott, T. A. ♦ Zhou, L. ♦ Moewes, A. ♦ Bartkowski, S. ♦ Neumann, M. ♦ Matsuno, J. ♦ Mizokawa, T. ♦ Fujimori, A. ♦ Mitchell, J.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ PRASEODYMIUM COMPOUNDS ♦ STRONTIUM COMPOUNDS ♦ PHOTOELECTRON SPECTROSCOPY ♦ PRASEODYMIUM OXIDES ♦ STRONTIUM OXIDES ♦ MANGANESE OXIDES ♦ X-RAY SPECTROSCOPY ♦ PEROVSKITES ♦ ELECTRONIC STRUCTURE ♦ FERMI LEVEL ♦ FERROMAGNETIC MATERIALS ♦ MAGNETORESISTANCE
Abstract The results of measurements of x-ray photoelectron (XPS), x-ray emission (XES), and x-ray absorption spectra and local spin-density approximation band structure (LSDA) calculations of Pr{sub 0.5}Sr{sub 0.5}MnO{sub 3} are presented. The excitation energy dependence of Mn L{sub 2,3} and O K{alpha} x-ray emission spectra of Pr{sub 0.5}Sr{sub 0.5}MnO{sub 3} is measured using tunable synchrotron radiation. The XES measurements yielded no photon energy dependence for the O K{alpha} spectra, but the Mn L{sub 2,3} spectra yielded inelastic scattering losses of 2 and 6 eV, corresponding to features in the structure of the occupied part of the valence band. Comparing XPS and XES measurements with LSDA band-structure calculations, one concludes that the electronic structure of the compound consists mainly of Mn 3d and O 2p states. States of 3d character localized at the Mn site predominate near the top of the valence band (VB). Some differences in the Mn 3d distribution in this part of the XPS valence band and Mn L{sub 3} XES with {ital d} symmetry due to spin-selection rules that govern the Mn L{sub 3} XES. In addition, the Mn 3d states distribution is hybridized with the O 2p part of the VB. Mn L{sub 3} XES spectra were determined relative to the Fermi energy by assuming normal x-ray emission begins from the lowest level of the p{sup 5}d{sup n+1}L intermediate state (which is the Mn 2p ionizatation threshold). From the local spin-density approximation, the orbital character of the Mn 3d electrons can be assigned e{sub g} symmetry at the top of the valence band T{sub 2g} in the central part of the VB, and equal contributions of e{sub g} and t{sub 2g} states at the bottom of the valence band. {copyright} {ital 1999} {ital The American Physical Society}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1999-05-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 59
Issue Number 20


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