Abstract
We have investigated orbital ordering in the bilayer manganite, $\text{Pr}{({\text{Sr}}_{0.1}{\text{Ca}}_{0.9})}_{2}{\text{Mn}}_{2}{\text{O}}_{7}$, using synchrotron x-ray diffraction techniques, in particular resonant soft x-ray diffraction. Diffraction signals are observed at $(0,\frac{1}{2},0)$ above 300 K and $(\frac{1}{2},0,0)$ below 300 K, corresponding to orbital stripes along the $a$ and $b$ axes, respectively. The previously observed transition at 300 K is evidence of a rotation of the orientation of the $3d$ orbital stripes. Large resonances of the orbital signals are observed at the $\text{Mn}\text{ }L$ edges, with a complex dependence on incident photon energy indicative of a weakly Jahn-Teller distorted system. A structural transition observed at 92 K is found not to involve a further change in the orbital order.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.