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

• 作者: Adel Shojaei Asadollah Joata-Bayrami Mohammad Moarrefi-Romeileh
• 来源期刊: 凝固态物理国际期刊(英文)
• 学科: 医学
• 关键词: MGB2 Optical Conductivity Two Gap Model BCS THEORY Green Function THEORY
• 年，卷（期）: 2015,（4）
• 页码范围: 353-360
• 页数: 8页
• 分类号: R73

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.