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Title: Energy and symmetry of dd excitations in undoped layered cuprates measured By Cu L3 resonant inelastic x-ray scattering
Authors: Moretti Sala, M.Bisogni, V.Aruta, C.Balestrino, G.Berger, H.Brookes, N.B.De Luca, G.M.Di Castro, D.Grioni, M.Guarise, M.Medaglia, P.G.Miletto, Granozio, F.Minola, M.Perna, P.Radovic, M.Salluzzo, M.Schmitt, T.Zhou, K.J.Braicovich, L.Ghiringhelli, G.
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Issue Date: 2011
Published in: New Journal of Physics Vol. 13 (2011)
Publisher: Bristol : IOP
Abstract: We measured the high-resolution Cu L3 edge resonant inelastic x-ray scattering (RIXS) of undoped cuprates La2CuO4, Sr2CuO2Cl2, CaCuO2 and NdBa 2Cu3O6. 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 singleion 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.
Keywords: Cooper pairing; Cross section; Crystal fields; Cuprates; D-d excitations; Effective parameters; Experimental assessment; Experimental data; High resolution; High-T; Layered cuprates; Magnetic excitations; Mid-infrared spectral range; Minimum energy; Orbital excitations; Resonant inelastic X-ray scattering; Scattering geometries; Single-ion; Spectral feature; Superconducting gaps; Two-dimensional clusters; Copper compounds; Superconductivity; X ray scattering; Scattering
DDC: 530
License: CC BY-NC-SA 3.0 Unported
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