Evidence of phonon-mediated coupling between charge transfer and ligand field excitons inSr2CuO2Cl2

2001/03/01 by R. Lövenich, Andreas Schumacher, A. B. Schumacher +4 · 4 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.63.235104

published as Phys. Rev. B 63, 235104 (2001) · 20 pages, 6 figures, submitted to Phys. Rev. B

arxiv created 2001/03/01 · openalex publication_date 2001/05/11 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30

Abstract

We present a comparative experimental and theoretical investigation of the two-dimensional charge transfer gap in the strongly correlated material Sr₂CuO₂Cl₂. We observe an Urbach behavior in the absorption profile over a surprisingly wide range of energies and temperatures. We present a model that accounts for phonon scattering to infinite order and that allows us to explain the data accurately by assuming coupling of the charge transfer gap exciton to lower-energy electronic excitations.

Citations

• Polarons and Excitons

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