Optical absorption spectra in SrCu_2O_3 two-leg spin ladder

Details Optical absorption spectra in SrCu_2O_3 two-leg spin ladder Optical absorption spectra in SrCu_2O_3 two-leg spin ladder

2003-04-15

arxiv.org/abs/cond-mat/0304319v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures, to appear in PRB vol. 67 (2003)

Scientific paper

10.1103/PhysRevB.67.134432

We calculate the phonon-assisted optical-absorption spectra in SrCu_2O_3 two-leg spin-ladder systems. The results for two models proposed for SrCu_2O_3 are compared. In the model including the effects of a cyclic four-spin interaction, the shoulder structure appears at 978 cm^{-1} and the peak appears at 1975 cm^{-1} in the spectrum for polarization of the electric field parallel to the legs. In the other model which describes a pure two-leg ladder, the peak appears around the lower edge of the spectrum at 1344 cm^{-1}. The feature can be effective in determining the proper model for SrCu_2O_3.

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