Speaker
Dr
J Schlappa
(Institute for Methods and Instrumentation for Synchrotron Radiation Research, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Str. 15, 12489 Berlin, Germany)
Description
Quantum effects become important, when the space symmetry is lowered. In the extreme case of one dimension the fundamental degrees of freedom of the electron can break up into separate quasi-particles carrying the spin, charge or orbital degrees of freedom. Here we report on studies of elementary excitations in quasi 1D cuprates, the spin-ladder/spin-chain compound Sr14Cu24O41 and the spin-chain Sr2CuO3, using Resonant Inelastic X-ray Scattering at the SAXES spectrometer at the ADRESS BL of the SLS at PSI, Switzerland. When the incident photon energy is tuned to the Cu 2p-3d resonance, elementary spin and orbital excitations can be observed in the low-energy and medium-energy range of 0-800 meV and 1.5-2.5 eV, respectively. Improvement of theoretical understanding of the X-ray scattering process allows for a quantitative analysis of the data. In the medium-energy range we observe for the first time the deconfinement of spinons and orbitons.
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Talk
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RIXS
Primary author
Dr
J Schlappa
(Institute for Methods and Instrumentation for Synchrotron Radiation Research, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Str. 15, 12489 Berlin, Germany)
Co-authors
Dr
B Delley
(Condensed Matter Theory Group, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland)
Dr
C Monney
(Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland)
Dr
F Vernay
(LAMPS, Université de Perpignan Via Domitia, 52 Avenue Paul Alduy, F-66860 Perpignan, France and Condensed Matter Theory Group, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland)
Prof.
H M Ronnow
(Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland)
Prof.
J F Mesot
(Paul Scherrer Institut, 5232 Villigen-PSI, Switzerland and Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland)
Dr
J S Caux
(Université Pierre et Marie Curie—CNRS UMR 7614, LCP-MR, Paris, France)
Dr
J van den Brink
(Leibniz Institute for Solid State and Materials Research IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany)
Dr
K J Zhou
(Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland)
Dr
K Wohlfeld
(Leibniz Institute for Solid State and Materials Research IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany)
Dr
L Patthey
(Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland)
Dr
M Mourigal
(Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland)
Dr
M W Haverkort
(Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany)
Dr
T Schmitt
(Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland)
Dr
V N Strocov
(Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland)
