Valence electronic structure of Mn in undoped and doped lanthanum manganites from relative K x-ray intensity studies

Details Valence electronic structure of Mn in undoped and doped lanthanum manganites from relative K x-ray intensity studies Valence electronic structure of Mn in undoped and doped lanthanum manganites from relative K x-ray intensity studies

2000-05-15

arxiv.org/abs/cond-mat/0005245v2

Physics

Condensed Matter

Materials Science

14 pages, 4 figures. to appear in NIM-B.Please send an e-mail for figures

Scientific paper

10.1016/S0168-583X(00)00587-5

Relative $K$ x-ray intensities of $Mn$ in $Mn$, $MnO_{2}$, $LaMnO_{3}$ and $La_{0.7}B_{0.3}MnO_{3}$ ($B$ = $Ca$, $Sr$, and $Ce$) systems have been measured following excitation by 59.54 keV $\gamma$-rays from a 200 mCi $^{241}$Am point-source. The measured results for the compounds deviate significantly from the results of pure $Mn$. Comparison of the experimental data with the multiconfiguration Dirac-Fock (MCDF) effective atomic model calculations indicates reasonable agreement with the predictions of ionic model for the doped {manganites except} that the electron doped $La_{0.7}Ce_{0.3}MnO_{3}$ and hole doped $La_{0.7}Ca_{0.3}MnO_{3}$ compounds show some small deviations. The results of $MnO_{2}$ and $LaMnO_{3}$ deviate considerably from the predictions of the ionic model. Our measured $K\beta/K\alpha$ ratio of $Mn$ in $La_{0.7}Ca_{0.3}MnO_{3}$ cannot be explained as a linear superposition of $K\beta/K\alpha$ ratios of $Mn$ for the end members which is in contrast to the recent proposal by Tyson et al. from their $Mn$ $K\beta$ spectra.

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