15–16 Sept 2011
Paul Scherrer Institut, Villigen, Switzerland
Europe/Zurich timezone

Orbital and magnetic excitations in the weakly coupled spin chain system CaCu2O3

17 Sept 2011, 10:20
20m
WBGB/019 (PSI)

WBGB/019

PSI

Talk Resonant Inelastic and Elastix X-ray Scattering Resonant Inelastic and Elastic X-ray Scattering

Speaker

Dr V Bisogni (IFW Dresden, Dresden, 01069, Germany)

Description

Recently, resonant inelastic X-ray scattering (RIXS) on the 1D spin chain system Sr2CuO3 has revealed an unprecedented dispersion of d-d excitations [1]. This result has been under-stood as an effect of strong interaction between spin and orbital degrees-of-freedom taking place within a single chain. In this talk we report on Cu L3 RIXS in quasi 1D CaCu2O3 con-sisting 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, Ca-Cu2O3 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 no dispersion has been found for the d-d excitations. This rais-es the question if the dispersion of orbital excitations is effectively being quenched as soon as two chains are connected to each other. 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. [1] J. Schlappa, K. Wohlfeld, J. van den Brink, T. Schmitt et al., private communication.

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Talk

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RIXS

Primary author

Dr V Bisogni (IFW Dresden, Dresden, 01069, Germany)

Co-authors

Dr B Büchner (IFW Dresden, Dresden, 01069, Germany) Dr C Monney (Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland) Dr J Geck (IFW Dresden, Dresden, 01069, Germany) Dr J Trinckauf (IFW Dresden, Dresden, 01069, Germany) Dr J van den Brink (IFW Dresden, Dresden, 01069, Germany) Dr K J Zhou (Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland) Dr K Wohlfeld (IFW Dresden, Dresden, 01069, 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)

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