Energy and symmetry of dd excitations in undoped layered cuprates measured by Cu L3 resonant inelastic x-ray scattering
By M. M. Sala, V. Bisogni, C. Aruta, G. Balestrino, H. Berger, N. Brookes, G. M. D. Luca, D. Castro, M. Grioni, Marco Guarise and 10 more. 2010
152 citations recorded by the source corpus.
We measured the high-resolution Cu L3 edge resonant inelastic x-ray scattering (RIXS) of undoped cuprates La2CuO4, Sr2CuO2Cl2, CaCuO2 and NdBa2Cu3O6. The dominant spectral features were assigned to dd excitations and we extensively studied their polarization and scattering geometry dependence. In a pure ionic picture, we calculated the theoretical cross sections for those excitations and used these to fit the experimental data with excellent agreement. By doing so, we were able to determine the energy and symmetry of Cu-3d states for the four systems with unprecedented accuracy and confidence. The values of the effective parameters could be obtained for the single-ion crystal field model but not for a simple two-dimensional cluster model. The firm experimental assessment of dd excitation energies carries important consequences for the physics of high-Tc superconductors. On the one hand, we found that the minimum energy of orbital excitation is always ⩾1.4 eV, i.e. well above the mid-infrared spectral range, which leaves to magnetic excitations (up to 300 meV) a major role in Cooper pairing in cuprates. On the other hand, it has become possible to study quantitatively the effective influence of dd excitations on the superconducting gap in cuprates.
Subfields: Condensed Matter Physics, Geophysics
View Paper: https://www.semanticscholar.org/paper/a0ab9fd938c56e6b086a293f2f2de537b3bd6683
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In Condensed Matter Physics
Citations in the corpus
- Long-Range Incommensurate Charge Fluctuations in (Y,Nd)Ba2Cu3O6+x (2012, result): “In Figure 2B, we compare the results to model calculations for spin-flip and non-spin-flip RXS from Cu2 sites with 3d(9)(x(2) − y(2)) ground state symmetry [25, 26].”