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

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 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.

arXiv comment4 pages, 5 figures

References in corpus (14)

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• Low temperature ellipsometry of NaV2O5
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• Optical Conductivity of the Trellis-Lattice t-J Model: Charge Fluctuations in NaV_2O_5
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• Charge-ordering and optical transitions of LiV2O5 and NaV2O5
• Superexchange in the quarter- filled two- leg ladder system NaV2O5

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• Low-energy Mott-Hubbard excitations in LaMnO_3 probed by optical ellipsometry
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• Optical properties, electron-phonon coupling, and Raman scattering of vanadium ladder compounds
• Charge and orbital order in transition metal oxides
• Spin-orbital physics in the optical conductivity of quarter-filled manganites
• Charge ordering in quarter-filled ladder systems coupled to the lattice
• Mott transition and collective charge pinning in electron doped Sr2IrO4
• Single-particle spectral function of quarter-filled ladder systems
• Spin and charge excitations in the anisotropic Hubbard ladder at quarter filling with charge-ordering instability
• Charge order induced by electron-lattice interaction in NaV2O5
• From frustrated insulators to correlated anisotropic metals: charge ordering and quantum criticality in coupled chain systems