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Determining the Short-Range Spin Correlations in Cuprate Chain Materials with Resonant Inelastic X-ray Scattering

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arxiv 1211.1925 v1 pith:FN7QFBZQ submitted 2012-11-08 cond-mat.str-el

Determining the Short-Range Spin Correlations in Cuprate Chain Materials with Resonant Inelastic X-ray Scattering

Claude Monney , Valentina Bisogni , Ke Jin Zhou , Roberto Kraus , Vladimir N. Strocov , Gunter Behr , Jiri Malek , Roman Kuzian
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Stefan-Ludwig Drechsler Steve Johnston Alexandre Revcolevschi Bernd Buchner Henrik M. Ronnow Jeroen van den Brink Jochen Geck Thorsten Schmitt
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classification cond-mat.str-el
keywords inelasticmaterialsscatteringcorrelationsenergyexcitationexcitonresonant
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We report a high-resolution resonant inelastic soft x-ray scattering study of the quantum magnetic spin-chain materials Li2CuO2 and CuGeO3. By tuning the incoming photon energy to the oxygen K-edge, a strong excitation around 3.5 eV energy loss is clearly resolved for both materials. Comparing the experimental data to many-body calculations, we identify this excitation as a Zhang-Rice singlet exciton on neighboring CuO4-plaquettes. We demonstrate that the strong temperature dependence of the inelastic scattering related to this high-energy exciton enables to probe short-range spin correlations on the 1 meV scale with outstanding sensitivity.

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