We measured the high-resolution Cu L-3 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-T-c 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.

Moretti Sala, M., Bisogni, V., Aruta, C., Balestrino, G., Berger, H., Brookes, N., et al. (2011). Energy and symmetry of dd excitations in undoped layered cuprates measured by Cu L(3) resonant inelastic x-ray scattering. NEW JOURNAL OF PHYSICS, 13 [10.1088/1367-2630/13/4/043026].

Energy and symmetry of dd excitations in undoped layered cuprates measured by Cu L(3) resonant inelastic x-ray scattering

BALESTRINO, GIUSEPPE;DI CASTRO, DANIELE;MEDAGLIA, PIER GIANNI;
2011-01-01

Abstract

We measured the high-resolution Cu L-3 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-T-c 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.
2011
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/03 - FISICA DELLA MATERIA
English
Article number: 043026
Moretti Sala, M., Bisogni, V., Aruta, C., Balestrino, G., Berger, H., Brookes, N., et al. (2011). Energy and symmetry of dd excitations in undoped layered cuprates measured by Cu L(3) resonant inelastic x-ray scattering. NEW JOURNAL OF PHYSICS, 13 [10.1088/1367-2630/13/4/043026].
Moretti Sala, M; Bisogni, V; Aruta, C; Balestrino, G; Berger, H; Brookes, N; de Luca, G; DI CASTRO, D; Grioni, M; Guarise, M; Medaglia, Pg; Granozio, ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/99208
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