Theoretical calculation of optical properties of Y-Ba-Cu-O superconductors
Guang-Lin Zhao, Yongnian Xu, W. Y. Ching, K. W. Wong
DOI 10.1103/PhysRevB.36.7203 · Physical Review B
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Abstract
The optical properties of orthorhombic YBa2Cu3O7 crystal are studied by a first-principles method. The interband optical conductivity shows strong directional anisotropy in the 0-3.0 eV range. A plasmon energy of 2.8 eV is predicted. Analysis of the static dielectric constant in the case of a semiconductorlike band structure supports the excitonic-enhanced superconducting mechanism in the Y-Ba-Cu-O system.
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