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Magnetic Excitations and Phase Separation in the Underdoped La2-xSrxCuO4 Superconductor Measured by Resonant Inelastic X-Ray Scattering (Articolo in rivista)

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Magnetic Excitations and Phase Separation in the Underdoped La2-xSrxCuO4 Superconductor Measured by Resonant Inelastic X-Ray Scattering (Articolo in rivista) (literal)

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Braicovich, L. and van den Brink, J. and Bisogni, V. and Moretti Sala, M. and Ament, L. J. P. and Brookes, N. B. and De Luca, G. M. and Salluzzo, M. and Schmitt, T. and Strocov, V. N. and Ghiringhelli, G. (2010)
Magnetic Excitations and Phase Separation in the Underdoped La2-xSrxCuO4 Superconductor Measured by Resonant Inelastic X-Ray Scattering
in Physical review letters (Print); The American Physical Society, College Park, MD 20740-3844 (Stati Uniti d'America)
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Braicovich, L. and van den Brink, J. and Bisogni, V. and Moretti Sala, M. and Ament, L. J. P. and Brookes, N. B. and De Luca, G. M. and Salluzzo, M. and Schmitt, T. and Strocov, V. N. and Ghiringhelli, G. (literal)

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L. Braicovich,1 L. J. P. Ament,2 V. Bisogni,3 F. Forte,2,4 C. Aruta,5 G. Balestrino,6 N. B. Brookes,3 G. M. De Luca,5 P. G. Medaglia,6 F. Miletto Granozio,5 M. Radovic,5 M. Salluzzo,5 J. van den Brink,2,7 and G. Ghiringhelli1 1 CNR-INFM Coherentia and Soft, Dipartimento di Fisica, Politecnico di Milano, I-20133 Milano, Italy 2 Institute-Lorentz for Theoretical Physics, Universiteit Leiden, NL-2300 RA Leiden, The Netherlands 3 European Synchrotron Radiation Facility, Bo?^te Postale 220, F-38043 Grenoble, France 4 CNR-INFM SuperMat, Dipartimento di Fisica, \"E.R. Caianiello\", Universita` di Salerno, I-84081 Baronissi, Italy 5 CNR-INFM Coherentia, Dipartimento Scienze Fisiche, Universita` di Napoli ''Federico II'', I-80126 Napoli, Italy 6 CNR-INFM Coherentia and Dipartimento di Ingegneria Meccanica, Universita` di Roma Tor Vergata, I-00133 Roma, Italy 7 Institute for Molecules & Materials, Radboud Universiteit Nijmegen, NL-6500 GL Nijmegen, The Netherlands (literal)

Titolo

Magnetic Excitations and Phase Separation in the Underdoped La2-xSrxCuO4 Superconductor Measured by Resonant Inelastic X-Ray Scattering (literal)

Abstract

We probe the collective magnetic modes of La2CuO4 and underdoped La2-xSrxCuO4 (LSCO) by momentum resolved resonant inelastic x-ray scattering (RIXS) at the Cu L-3 edge. For the undoped antiferromagnetic sample, we show that the single magnon dispersion measured with RIXS coincides with the one determined by inelastic neutron scattering, thus demonstrating that x rays are an alternative to neutrons in this field. In the spin dynamics of LSCO, we find a branch dispersing up to similar to 400 meV coexisting with one at lower energy. The high-energy branch has never been seen before. It indicates that underdoped LSCO is in a dynamic inhomogeneous spin state. (literal)

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