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

Markus Aichhorn, Peter Horsch, Wolfgang von der Linden, Mario Cuoco

Research output: Contribution to journalArticleResearchpeer-review

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 α′-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.
Original languageEnglish
Pages (from-to)201101
Number of pages1
JournalPhysical Review / B
Volume65
Issue number20
DOIs
Publication statusPublished - 2002

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Optical conductivity
Ladders
ladders
Kinetic energy
temperature dependence
destruction
kinetic energy
conductivity
Temperature
energy

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Temperature dependence of optical spectral weights in quarter-filled ladder systems. / Aichhorn, Markus; Horsch, Peter; von der Linden, Wolfgang; Cuoco, Mario.

In: Physical Review / B, Vol. 65, No. 20, 2002, p. 201101.

Research output: Contribution to journalArticleResearchpeer-review

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AB - 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 α′-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.

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