The effect of interband interactions of phonon and charge fluctuation on the superconducting parameters of MgB2

被引：4
作者：
Abah, O. C. [1 ]
Asomba, G. C. [1 ]
Okoye, C. M. I. [1 ]
机构：
[1] Univ Nigeria, Dept Phys & Astron, Nsukka, Nigeria
来源：
SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2010年 / 23卷 / 04期
关键词：
ELECTRONIC-STRUCTURE; 2-BAND MODEL; T-C; ISOTOPE; PLASMONS; BORON; GAPS;
D O I：
10.1088/0953-2048/23/4/045031
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have investigated the effect of an unconventional pairing mechanism in MgB2 using a two-band model within the framework of Bogoliubov-Valatin formalism. The approach incorporates the intraband s-wave interaction in the s- and p-bands, as well as interband s-wave interaction between them. The analysis assumes that the pairing interaction matrix comprises of attractive electron-phonon, charge fluctuation and repulsive electron-electron (Coulomb) interactions to account for superconductivity in MgB2. The model is used to estimate the transition temperature and isotope effect exponent as well as to elucidate the importance of interband contributions in the superconductivity of the system
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页数：6
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