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Journal article

Optical excitations in Sr₂CuO₃

  • Kim, Kyung Wan Department of Physics, University of Fribourg, Switzerland - School of Physics and Research Center for Oxide Electronics, Seoul National University, Korea
  • Gu, G. D. Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York, USA
    24.02.2009
Published in:
  • Physical Review B. - 2009, vol. 79, no. 8, p. 085121
charge transfer states
excitons
high-temperature superconductors
Hubbard model
optical conductivity
reflectivity
strontium compounds
English We investigated excitation spectra of the one-dimensional chain compound Sr₂CuO₃. The small peak at 2.3 eV in the loss function turned out to correspond to the strong charge-transfer transition at 1.8 eV in conductivity. It has the excitonic character expected in one-dimensional extended Hubbard model of the transition from the lower Hubbard band to the Zhang-Rice singlet state. The strongest peak at 2.7 eV in the loss function is attributed to the continuum excitation of the excitonic charge-transfer transition. The spectral weight sum rule is satisfied within these transitions.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
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Persistent URL
https://folia.unifr.ch/unifr/documents/301219
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