Temperature dependent optical conductivity of undoped cuprates with weak exchange

Abstract

The optical conductivity sigma(omega) is calculated at finite temperature T for CuO_2 chain clusters within a pd-Hubbard model. Data at T = 300 K for Li_2CuO_2 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 sigma(omega) on the ratio of the first to second neighbor exchange integrals is predicted. On the basis of these results, information about exchange interactionsfor 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.

5 pages, 3 figures

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• Thermodynamics of a one-dimensional frustrated spin-1/2 Heisenberg ferromagnet
• Influence of an inter-chain coupling on spiral ground-state correlations in frustrated spin-1/2 J1-J2 Heisenberg chains
• Evidence for a magnetic field-induced unconventional nematic state in the frustrated and anisotropic spin-chain cuprate LiCuSbO${}_4$
• The strength of frustration and quantum fluctuations in LiVCuO4
• Magnetic structure of the edge-sharing copper oxide chain compound NaCu2O2
• Ca2Y2Cu5O10: the first frustrated quasi-1D ferromagnet close to criticality
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• Thermodynamics of the frustrated one-dimensional spin-1/2 Heisenberg ferromagnet in a magnetic field
• Spiral correlations in frustrated one-dimensional spin-1/2 Heisenberg J1-J2-J3 ferromagnets
• Highly dispersive magnons with spin-gap like features in the frustrated ferromagnetic S=1/2 chain compound Ca2Y2Cu5O10 detected by inelastic neutron scattering
• Low-temperature properties of classical zigzag spin chain at the ferromagnet-helimagnet transition point
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• Comment on `Oxygen vacancy-induced magnetic moment in edge-sharing CuO${}_2$ chains of Li${}_2$CuO${}_2$'
• Ab initio ligand field approach to determine electronic multiplet properties
• Low-temperature thermodynamics of the classical frustrated ferromagnetic chain in magnetic field
• Optical excitations in Sr${}_2$CuO${}_3$
• Analysis of the magnetic response of the edge-sharing chain cuprate Li${}_2$CuO${}_2$ within TMRG