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Optical studies of gap, hopping energies and the Anderson-Hubbard parameter in the zigzag-chain compound SrCuO2 | | Z. V. Popovic
; V. A. Ivanov
; M. J. Konstantinovic
; A. Cantarero
; J. Martinez-Pastor
; D. Olguin
; M. I. Alonso
; M. Garriga
; O. P. Khuong
; A. Vietkin
; V. V. Moshchalkov
; | | Date: |
19 Dec 2000 | | Journal: | Phys. Rev. B 63, 165105 (2001) | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | We have investigated the electronic structure of the zigzag ladder (chain) compound SrCuO2 combining polarized optical absorption, reflection, photoreflectance and pseudo-dielectric function measurements with the model calculations. These measurements yield an energy gap of 1.42 eV (1.77 eV) at 300 K along (perpendicular) to the Cu-O chains. We have found that the lowest energy gap, the correlation gap, is temperature independent. The electronic structure of this oxide is calculated using both the local-spin-density-approximation with gradient correction method, and the tight-binding theory for the correlated electrons. The calculated density of electronic states for non-correlated and correlated electrons shows quasi-one-dimensional character. The correlation gap values of 1.42 eV (indirect transition) and 1.88 eV (direct transition) have been calculated with the electron hopping parameters t = 0.30 eV (along a chain), t_yz = 0.12 eV (between chains) and the Anderson-Hubbard repulsion on copper sites U= 2.0 eV. We concluded that SrCuO_2 belongs to the correlated-gap insulators. | | Source: | arXiv, cond-mat/0101302 | | Services: | Forum | Review | PDF | Favorites | |
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