Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 19: Correlated Electrons: Metal-Insulator Transition 3
TT 19.3: Vortrag
Dienstag, 24. März 2009, 14:30–14:45, HSZ 301
Application of Sum Rules to Resonant Magnetic Diffraction — •Marcel Buchholz1, Christian Schüßler-Langeheine1, Maurits W. Haverkort1,2, Hsueh-Hung Wu1,3, Chun-Fu Chang1, Matthias Cwik1, Mohammed Benomar1, Enrico Schierle4, Arata Tanaka5, Markus Braden1, and Liu Hao Tjeng1 — 1II. Physikalisches Institut, Universität zu Köln — 2Max Planck Institut für Festkörperforschung, Stuttgart — 3NSRRC, Hsinchu, Taiwan — 4Helmholtz-Zentrum Berlin — 5ADSM, Hiroshima University, Japan
Sum rules relating the spin and orbital moment to integrals over the x-ray magnetic circular dichroism (XMCD) signal are well established and widely used to determine fundamental quantum numbers for ferromagnetic systems.
Resonant magnetic diffraction is closely related to the XMCD effect and can be used to apply sum rules also to magnetically ordered systems without net magnetic moment like antiferromagnets or magnetically ordered systems with multiple sublattices. We tested this approach using holmium metal as a model system. The determination of the proper phase turns out to be a crucial point in the analysis.
We applied the sum-rule analysis to Sr- and Ca-doped La2CoO4 and compare the results to microscopic model calculations.
Supported by the DFG through SFB 608 and by the BMBF through 05 ES3XBA/5.