19 September 2005 Soft x-ray resonant diffraction in transition metal oxides
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We discuss recent soft x-ray resonant diffraction studies of magnetic and structural correlations in manganites and cobaltates. In half-doped manganites, the resonant enhancement of super-lattice diffraction peaks resulting from orbital and magnetic order is utilized to make a direct comparison of orbital and spin correlations. The main finding is that the correlation length associated with magnetic order exceeds that of the orbital order by of order a factor of two--a result which appears at odds with orbitally driven magnetic exchange pathways. Similar resonant diffraction measurements at the Co L-edge were performed to study the oxygen-doped cobaltate Bi2Sr2CoO6+δ, in which we find a surprising incommensurate antiferromagnetic order.
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K. Jessica Thomas, K. Jessica Thomas, S. Grenier, S. Grenier, J. P. Hill, J. P. Hill, F. C. Chou, F. C. Chou, Y. Tomioka, Y. Tomioka, Y. Tokura, Y. Tokura, P. Abbamonte, P. Abbamonte, } "Soft x-ray resonant diffraction in transition metal oxides", Proc. SPIE 5932, Strongly Correlated Electron Materials: Physics and Nanoengineering, 59322A (19 September 2005); doi: 10.1117/12.624677; https://doi.org/10.1117/12.624677


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