Author(s)

Adel Shojaei¹, Mohammad Moarrefi-Romeileh^2*, Asadollah Joata-Bayrami³

¹Department of Physics, Behbehan Branch, Islamic Azad University, Behbehan, Iran.
²Department of Physics, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.
³Department of Science, Omeidieh Branch, Islamic Azad University, Omeidieh, Iran.

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.

MgB₂, Optical Conductivity, Two Gap Model, BCS Theory, Green Function Theory

Shojaei, A. , Moarrefi-Romeileh, M. and Joata-Bayrami, A. (2015) Frequency Dependence of Optical Conductivity in MgB₂ Superconductor. World Journal of Condensed Matter Physics, 5, 353-360. doi: 10.4236/wjcmp.2015.54036.