Abstract
We have investigated the effect of an unconventional pairing mechanism inMgB2 using a two-band model within the framework of Bogoliubov–Valatin formalism. Theapproach incorporates the intraband s-wave interaction in the s- and p-bands, as well asinterband s-wave interaction between them. The analysis assumes that the pairinginteraction matrix comprises of attractive electron–phonon, charge fluctuation andrepulsive electron–electron (Coulomb) interactions to account for superconductivity inMgB2. The model is used to estimate the transition temperature and isotope effect exponent aswell as to elucidate the importance of interband contributions in the superconductivity ofthe system
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