Optical excitations in Sr₂CuO₃

Kim, Kyung Wan; Gu, G. D.

doi:10.1103/PhysRevB.79.085121

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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

high-temperature superconductors

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