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arXiv · 1211.1925

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·Stefan-Ludwig Drechsler·Steve Johnston·Alexandre Revcolevschi·Bernd Buchner·Henrik M. Ronnow·Jeroen van den Brink·Jochen Geck·Thorsten Schmitt
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Abstract

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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Claude Monney, Valentina Bisogni, Ke Jin Zhou, Roberto Kraus, Vladimir N. Strocov, Gunter Behr, Jiri Malek, Roman Kuzian, Stefan-Ludwig Drechsler, Steve Johnston, Alexandre Revcolevschi, Bernd Buchner, Henrik M. Ronnow, Jeroen van den Brink, Jochen Geck, Thorsten Schmitt. 2012-11-08. Determining the Short-Range Spin Correlations in Cuprate Chain Materials with Resonant Inelastic X-ray Scattering. https://doi.org/10.1103/physrevlett.110.087403

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