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Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 49: CE: Spin Systems and Itinerant Magnets 2

TT 49.16: Vortrag

Donnerstag, 17. März 2011, 18:15–18:30, HSZ 03

Probing the local magnetic structure of a quasi-1D cuprate with Resonant Inelastic X-Ray Scattering — •Claude Monney1, Valentina Bisogni2, Kejin Zhou1, Roberto Kraus2, Vladimir Strocov1, Jochen Geck2, and Thorsten Schmitt11Paul Scherrer Institut, Villigen PSI, Switzerland — 2IFW, Dresden, Germany

The quasi-one-dimensional cuprate Li2CuO2 is a prototype edge-sharing chain compound. The Cu2+ ions in this strongly correlated material give rise to one spin 1/2 per CuO4 plaquette with a nearest neighbor Cu-O-Cu bond angle close to 90 implying weak superexchange between Cu spins. As a result, spins order antiferromagnetically between the chains below TN ∼ 9K, but ferromagnetically in the chains. We have performed Resonant Inelastic X-ray Scattering (RIXS) at Cu L3 and O K-resonances at the ADRESS beamline of the Swiss Light Source on this compound. Our momentum resolved RIXS measurements at the Cu L3-edge allow analyzing orbital excitations with high sensitivity. At the O K-edge, the RIXS spectra display a complicated interplay of low-energy excitations from charge, orbital and lattice degrees of freedom. In particular, we discuss charge transfer related spectral components in the scenario of exotic Zhang-Rice (ZR) singlet and triplet excitations which can be reached in the final state with O K-edge RIXS. The intensity of the ZR features can be related to the thermodynamics of domain walls in one dimension. This establishes RIXS as an excellent probe for investigating local magnetic order.

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