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TT: Fachverband Tiefe Temperaturen

TT 5: Correlated Electrons - (General) Theory

TT 5.2: Vortrag

Montag, 26. März 2007, 14:30–14:45, H18

Determining the ordered orbital and spin momentum as well as orbital order with the use of sum-rules in x-ray resonant scattering. — •M. W. Haverkort, C. Schüßler-Langeheine, T. Willers, and L. H. Tjeng — II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany

Sum-rules in x-ray circular dichroism relating the integrated intensity of the x-ray absorption spectra taken with different circular polarizations to the total spin and orbital momentum are well known. Less known, but derived on the same principles, are sum rules for linear dichroism relating the absorption intensity with different linear polarizations to the orbital occupation. We extended these sum-rules, known for x-ray absorption spectroscopy, to the closely related method of resonant x-ray scattering, and show how to use this method to obtain quantitative information on charge, orbital, orbital momentum and on spin ordering even in antiferromagnetic systems. Supported by the DFG through SFB 608.