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

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

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Moretti Sala, M. and Bisogni, V. and Aruta, C. and Balestrino, G. and Berger, H. and Brookes, N. B. and de Luca, G. M. and Di Castro, D. and Grioni, M. and Guarise, M. and Medaglia, P. G. and Granozio, F. Miletto and Minola, M. and Perna, P. and Radovic, M. and Salluzzo, M. and Schmitt, T. and Zhou, K. J. and Braicovich, L. and Ghiringhelli, G. (2011)
Energy and symmetry of dd excitations in undoped layered cuprates measured by Cu L(3) resonant inelastic x-ray scattering
in New journal of physics; IOP Publishing Ltd. (Institute of Physics Publishing Ltd), "Bristol ; London" (Regno Unito)
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Moretti Sala, M. and Bisogni, V. and Aruta, C. and Balestrino, G. and Berger, H. and Brookes, N. B. and de Luca, G. M. and Di Castro, D. and Grioni, M. and Guarise, M. and Medaglia, P. G. and Granozio, F. Miletto and Minola, M. and Perna, P. and Radovic, M. and Salluzzo, M. and Schmitt, T. and Zhou, K. J. and Braicovich, L. and Ghiringhelli, G. (literal)

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M Moretti Sala 1,8,9, V Bisogni 2,10, C Aruta 3, G Balestrino 4, H Berger 5, N B Brookes 2 , G M de Luca 3, D Di Castro 4, M Grioni 5, M Guarise 5, P G Medaglia 4, F Miletto Granozio 3, M Minola 1, P Perna 3, M Radovic 3, 11, M Salluzzo 3, T Schmitt 6, K J Zhou 6, L Braicovich 7 and G Ghiringhelli 7 1 CNISM and Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy 2 European Synchrotron Radiation Facility, Boîte Postale 220, F-38043 Grenoble, France 3 CNR-SPIN and Dipartimento di Scienze Fisiche, Università di Napoli 'Federico II', Complesso di Monte S Angelo, Via Cinthia, I-80126 Napoli, Italy 4 CNR-SPIN and Dipartimento di Ingegneria Meccanica, Universitá di Roma Tor Vergata, Via del Politecnico 1, I-00133 Roma, Italy 5 Ecole Polytechnique Fédérale de Lausanne (EPFL), Institut de Physique de la Matiére Condensée, CH-1015 Lausanne, Switzerland 6 Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland 7 CNR-SPIN and Dipartimento di Fisica, Politecnico di Milano, piazza Leonardo da Vinci 32, I-20133 Milano, Italy (literal)

Titolo

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

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. (literal)

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