AI Article Synopsis
- The study investigates the quantum magnetic spin-chain materials Li(2)CuO(2) and CuGeO(3) using high-resolution resonant inelastic soft x-ray scattering.
- By targeting the oxygen K edge, a significant excitation at around 3.5 eV is observed in both materials, which is linked to a specific type of exciton.
- The research highlights the temperature-dependent nature of this excitation, allowing for sensitive measurements of short-range spin correlations at the millielectronvolt scale.
Article Abstract
We report a high-resolution resonant inelastic soft x-ray scattering study of the quantum magnetic spin-chain materials Li(2)CuO(2) and CuGeO(3). 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 CuO(4) plaquettes. We demonstrate that the strong temperature dependence of the inelastic scattering related to this high-energy exciton enables us to probe short-range spin correlations on the 1 meV scale with outstanding sensitivity.
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| http://dx.doi.org/10.1103/PhysRevLett.110.087403 | DOI Listing |
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