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Abstract:
The temperature dependence of the integrated optical
conductivity I(T) reflects the changes of the kinetic energy as
spin and charge correlations develop. We calculated I(T) in the
frame of a t-J-V model for ladder systems, such as alpha(')-
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 the T dependence of superexchange energy and
thereby allows for an independent determination of magnetic
energy scales.
