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.
Please specify the session
RIXS
Please specify poster or talk
Talk
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)
