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Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 38: Correlated Electrons: Spin Systems and Itinerant Magnets 1

TT 38.4: Talk

Thursday, March 29, 2012, 10:15–10:30, H 3010

Orbital and magnetic excitations in the weakly coupled spin chain system CaCu2O3 — •Valentina Bisogni1, Krzysztof Wohlfeld1, Roberto Kraus1, Jan Trinckauf1, Claude Monney2, Satoshi Nishimoto1, Ke Jin Zhou2, Vladimir Strocov2, Bernd Büchner1, Jeroen van den Brink1, Thorsten Schmitt2, and Jochen Geck11IFW Dresden, Dresden, Germany — 2Paul Scherrer Institut, Villigen PSI, Switzerland

Recently, resonant inelastic X-ray scattering (RIXS) on the 1D spin chain system Sr2CuO3 has revealed an unprecedented and strong dispersion of d-d excitations. This result has been interpreted as the spin and orbital separation from the elementary electron in a 1D S=1/2 system. In this talk we report on Cu L3 RIXS in quasi 1D CaCu2O3 consisting of two coupled spin chains. Due to its buckled geometry, the inter-chain interaction of this system is one order of magnitude smaller than the in-chain interaction. Therefore, CaCu2O3 is an ideal model system to study the effect of a weak inter-chain interaction on both the low (spin excitation) and the high (d-d excitations) energy scale. Although the dispersion of the spinon continuum can largely be accounted for by neglecting the presence of the inter-chain interaction, surprisingly the absence of a strong dispersion in the d-d excitations emerges from the raw data. A deep analysis of these results shows indeed that the various orbital channels feel different dimensionalities, 1D or 2D. The important role played by inter-chain interactions for the magnetic and orbital excitations in this class of compounds will be discussed in this context.

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