Temperature dependence of optical spectral weights in quarter-filled ladder systems
Markus Aichhorn, Peter Horsch, Wolfgang von der Linden, Mario Cuoco
Abstract
The temperature dependence of the integrated optical conductivity I(T) reflects the changes of the kinetic energy as spin and charge correlations develop. It provides a unique way to explore experimentally the kinetic properties of strongly correlated systems. We calculated I(T) in the frame of a t-J-V model at quarter-filling for ladder systems, like NaV2O5, and show that the measured strong T dependence of I(T) for NaV2O5 can be explained by the destruction of short range antiferromagnetic correlations. Thus I(T) provides detailed information about super-exchange and magnetic energy scales.
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