Temperature-dependent optical conductivity of undoped cuprates with weak exchange

2008/07/05 by J. Malek, Jiřı́ Málek, S.‐L. Drechsler +6 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Atomic physics #Charge (physics) #Condensed matter physics #Conductivity #Cuprate #Excited state #Hubbard model #Magnetic and transport properties of perovskites and related materials #Omega #Optical conductivity #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Sigma #Singlet state #Superconductivity #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.78.060508

5 pages, 3 figures

arxiv created 2008/07/05 · openalex publication_date 2008/08/27 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

The optical conductivity \ensuremathσ(\ensuremathω) is calculated at finite temperature T for CuO₂ chain clusters within a pd-Hubbard model. Data at T=300 K for Li₂CuO₂ are reanalyzed within this approach. The relative weights of Zhang-Rice singlet and triplet charge excitations near 2.5 and 4 eV, respectively, depend strongly on T, and a rather dramatic dependence of \ensuremathσ(\ensuremathω) on the ratio of the first to second neighbor exchange integrals is predicted. On the basis of these results, information about exchange interactions for frustrated edge-shared cuprates can be obtained from T-dependent optical spectra. Our results are also relevant for magnetically weakly coupled wide-gap insulators in general.

Citations

• The pragmatics of scientific representation
• Charge and orbital excitations inLi2CuO2
• Temperature and dimensionality dependencies of optical absorption spectra in Mott insulators
• Temperature dependence of optical spectral weights in quarter-filled ladder systems
• Magnetic structure ofLi2CuO2: Fromab initiocalculations to macroscopic simulations

Cited by

• Exciton Doublet in the Mott-Hubbard InsulatorLiCuVO4Identified by Spectral Ellipsometry

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