The thermodynamic properties of the superconductor: The two-band Eliashberg equations

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• 作者：R. Szczë ; s̀ ; niak
• 关键词：A. Superconductors ; D. Thermodynamic properties
• 刊名：Solid State Communications
• 出版年：2008
• 期刊代码：101_00381098
• 类别：ms
• 出版时间：January 2008
• 卷：145
• 期：3
• 页码：137-142
• 文件大小：976 K

摘要

In the present paper it was shown that the critical value of the Coulomb pseudopotential () for MgB₂ is 0.03578; the calculated value of essentially differs from the value given by G.A. Ummarino et al. [G.A. Ummarino, R.S. Gonnelli, S. Massidda, A. Bianconi, Physica C 407 (2004) 121]. Assuming , for the selected values of temperature, the order parameters for σ and π band (Δ_σ and Δ_π) as well as the wave function renormalization factors (Z_σ and Z_π) were calculated. The ratios were estimated, where a is the band index and T_C is a value of the critical temperature. Values of R_σ=4.24 and R_π=1.54 were obtained. In the present work a total normalized density of states function was also calculated. In the last step the values of the wave function renormalization factors that define effective mass of electrons from the σ and π band were estimated for T_C; [Z_σ]_ω=0=2.32 and a2050dde2c21c06e45075c" title="Click to view the MathML source">[Z_π]_ω=0=1.63. Obtained results were compared with experimental data and with the other theoretical predictions.