Temperature dependence of optical spectral weights in quarter-filled ladder systems

Details Temperature dependence of optical spectral weights in quarter-filled ladder systems Temperature dependence of optical spectral weights in quarter-filled ladder systems

2001-08-28

arxiv.org/abs/cond-mat/0108465v1

Phys. Rev. B 65, 201101(R) (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevB.65.201101

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 NaV_2O_5, and show that the measured strong T dependence of I(T) for NaV_2O_5 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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