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Frequency Dependence of Optical Conductivity in MgB<sub>2</sub>Superconductor

Frequency Dependence of Optical Conductivity in MgB<sub>2</sub>Superconductor
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摘要 Using Green’s function method, the frequency dependence of optical conductivities of high-quality MgB2 film is calculated in the framework of the single- and two-band model. By comparing the numerical and experimental results, it is shown that the single-gap isotropic model is insufficient to understand consistently optical behaviors. Also, it is concluded that the two-band model consistently describes the optical behaviors. In the two-gap model, we consider that the both components of optical conductivity are a weighted sum of the contribution from σ and π bonds and hybridization between them is negligible. Using Green’s function method, the frequency dependence of optical conductivities of high-quality MgB2 film is calculated in the framework of the single- and two-band model. By comparing the numerical and experimental results, it is shown that the single-gap isotropic model is insufficient to understand consistently optical behaviors. Also, it is concluded that the two-band model consistently describes the optical behaviors. In the two-gap model, we consider that the both components of optical conductivity are a weighted sum of the contribution from σ and π bonds and hybridization between them is negligible.
出处 《World Journal of Condensed Matter Physics》 2015年第4期353-360,共8页 凝固态物理国际期刊(英文)
关键词 MGB2 Optical Conductivity Two Gap Model BCS THEORY Green Function THEORY MgB2 Optical Conductivity Two Gap Model BCS Theory Green Function Theory
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