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MA: Magnetismus

MA 13: Poster:Schichten(1-23),Spinabh.Trsp(24-41),Exch.Bias(42-56),Spindyn.(57-67),Mikromag.(68-76),Partikel(77-90),Spinelektr.(91-97),Elektr.Theo.(98-99),Mikromag+PhasÜ+Aniso.(100-105),Magn.Mat.(106-118),Messmethod.(119-121),Obflm.+Abbverf.(122-123)

MA 13.118: Poster

Dienstag, 9. März 2004, 15:00–19:00, Bereich A

X-ray resonance exchange scattering from 4d transition metal compounds — •Ioannis Zegkinoglou¹, Joerg Strempfer¹, Christie S. Nelson², John P. Hill², Jonathan Lang³, George Srajer³, and Bernhard Keimer¹ — ¹Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany — ²Department of Physics, Brookhaven National Laboratory, Upton, NY 11973-5000, USA — ³Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA

We present results of x-ray resonance exchange scattering (XRES) from single crystal Ca₂RuO₄, performed at the Ru L₂ and L₃ absorption edges at photon energies between 2.8 keV and 3 keV. A large resonance enhancement of the magnetic signal is observed. Its origin lies in the 2p → 4d dipolar electronic transitions that probe directly the 4d orbitals, which are responsible for magnetism. This provides new possibilities of studying the magnetic properties, as well as possible charge- and orbital- ordering in 4d transition metal compounds. The enhancement at K-edges, where the d-orbitals are only probed indirectly via the p-orbitals, is generally much weaker.