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2010 | 117 | 2 | 277-280
Article title

Electronic States of Collosal Magnetoresistive Manganites La_{0.67}Pb_{0.33}Mn_{1-x}Fe_{x}O_{3} from Photoemission Spectroscopy

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EN
Abstracts
EN
The electron photoemission spectra of valence bands and core-level states of manganese perovskite La_{0.67}Pb_{0.33}(Mn_{1-x}Fe_{x})O_{3} with x = 0, 0.01, 0.03, 0.06, 0.10 and 0.15 were measured by the X-ray and Ultraviolet Photoemission Spectroscopy (XPS and UPS) below and above the metal-insulator transition. From analysis of the Mn 2p core-level spectra the ratio Mn^{3+}/Mn^{4+} was calculated as a function of the iron content. Comparison of the valence band spectrum with band structure calculations and with the high-resolution spectra measured at synchrotron radiation for Ca-, Ba- and Ce- substituted manganites revealed the strong hybridisation of Mn 3d and of O 2p states between -3 eV and -7 eV, and no estimated oxygen states between 0 eV and -2 eV where the Mn-3d states play a predominant role. The composition dependent insulating energy gaps were measured at room temperature. Reasons for the behaviour were discussed taking into account previous analysis of XPS/UPS spectra of other manganese perovskites.
Keywords
Year
Volume
117
Issue
2
Pages
277-280
Physical description
Dates
published
2010-02
References
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Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv117n205kz
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