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Evidence for Mn2+ i...
Evidence for Mn2+ ions at surfaces of La0. 7Sr 0.3MnO3 thin films
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- de Jong, Michel P (författare)
- Linköpings universitet,Tekniska högskolan,Ytors Fysik och Kemi
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- Bergenti, I. (författare)
- ISMN-Bo CNR, via Gobetti 101, 40129 Bologna, Italy
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- Dediu, V.A. (författare)
- ISMN-Bo CNR, via Gobetti 101, 40129 Bologna, Italy
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- Fahlman, Mats (författare)
- Linköpings universitet,Tekniska högskolan,Ytors Fysik och Kemi
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- Marsi, M. (författare)
- Sincrotrone Trieste, Area Science Park, I-34012 Trieste, Italy
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- Taliani, C. (författare)
- ISMN-Bo CNR, via Gobetti 101, 40129 Bologna, Italy
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(creator_code:org_t)
- 2005
- 2005
- Engelska.
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Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 71:1
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We present a detailed investigation of the valence of manganese sites at the surface of colossal magnetoresistance La0.7Sr 0.3MnO3 (LSMO) thin films by x-ray absorption spectroscopy (XAS). The XAS Mn L-edge spectra of epitaxial LSMO films usually show a peak or shoulder at 640 eV. Differences in the intensity of this feature are commonly attributed to slight changes in the Mn3+/Mn4+ ratio or the crystal field strength. By comparison of different XAS spectra of LSMO thin films with the known multiplet structure of Mn2+ in a cubic crystal field, we assign this 640-eV feature to Mn2+ ions. XAS with increased surface sensitivity, combined with photon energy-dependent photoelectron spectroscopy measurements of the Mn(3s) exchange splitting, show that the Mn2+ species are mainly located at the surface. The Mn2+ scenario indicates significant modification of the LSMO surface with respect to the bulk properties that should be taken into account in all the charge and spin tunneling and injection experiments. © 2005 The American Physical Society.
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