X-ray emission studies of evolution of the electron and spin structures of Mn in mixed manganites Ln 1 - x Sr x MnO3 ( Ln = La, Sm, and Ce)
Abstract
The chemical shift Δ E_{K_{β 1} } and the exchange splitting Δ E split of the emission X-ray Mn K β1 line in mixed manganites Ln 1 - x Sr x MnO3 ( Ln = La, Sm, and Ce) have been systematically studied for the first time. It has been found that Δ E_{K_{β 1} } and Δ E split are almost the same in the range x < 0.4-0.5, as is the case in Mn2O3, and then they decrease relatively quickly to the values characteristic of MnO2. It has been assumed that such a behavior corresponds to the model where in the region of hole doping ( x < 0.5), the ground state is a mixture of configurations Mn3+ 3 d 4 and 3d^4 L, so that the second configuration fraction increases with x. At high values of x, the configuration Mn4+ 3 d 3 should be taken into account; the contribution of this configuration increases with increasing degree of doping, and it becomes dominant at x = 1. In all cases, the manganese state is high-spin.
- Publication:
-
Physics of the Solid State
- Pub Date:
- April 2012
- DOI:
- 10.1134/S1063783412040282
- Bibcode:
- 2012PhSS...54..778S