Resonant x-ray scattering of the Bi1-xSrxMnO3 (x<=0.5) charge-ordered phases
Abstract
Charge-orbital ordering (CO-OO) in Bi1-xSrxMnO3 (x=0.3, 0.5) have been studied by resonant x-ray scattering (RXS) at the Mn K edge. Strong resonances were observed at the Mn K-edge for weak superstructure (h00), (0k0) and forbidden (h/200), (0k/20) reflections with h, k odd within the ab plane (Ibmm setting) in both single crystals. Additional (hk0) and (hk/20) with k odd have also been studied. The azimuth angle and polarization dependence of the resonant intensity for this set of reflections point out to a structural transition at the TCOO that stabilizes an checkerboard ordering of two non-equivalent Mn atoms with different local geometrical structures and a very small charge segregation for both x=0.5 and x=0.3 compounds. We can conclude that A1-xBxMnO3 tends to order in a checkerboard pattern independently of the nature of the A and B atoms and for x even far from 0.5. Furthermore, the electronic states of the two non-equivalent Mn atoms are far from the ionic (+3 and +4) species.
- Publication:
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APS March Meeting Abstracts
- Pub Date:
- March 2007
- Bibcode:
- 2007APS..MARA11010G