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Effect of interband interaction on isotope effect exponent of MgB2 superconductors

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Abstract

The exact formula of Tc’s equation and the isotope effect exponent of two-band s-wave superconductors in the weak-coupling limit are derived by considering the influence of interband interaction. In each band, our model consists of two pairing interactions: the electron-phonon interaction and non-electron-phonon interaction. We find that the isotope effect exponent of MgB2, α = 0.3 with Tc ≈ 40 K can be found in the weak coupling regime and interband interaction of electron-phonon shows more effect on the isotope effect exponent than on the interband interaction of non-phonon.

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Authors and Affiliations

  1. Department of Physics, Faculty of Science, Srinakharinwirot University, 10110, Bangkok, Thailand

    P. Udomsamuthirun, A. Burakorn & P. Changkanarth

  2. Department of Basic Science, School of Science, The University of the Thai Chamber of Commerce, 10400, Dindaeng, Bangkok, Thailand

    C. Kumvongsa

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  1. P. Udomsamuthirun
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  2. C. Kumvongsa
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  3. A. Burakorn
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  4. P. Changkanarth
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Udomsamuthirun, P., Kumvongsa, C., Burakorn, A. et al. Effect of interband interaction on isotope effect exponent of MgB2 superconductors. Pramana - J Phys 66, 589–596 (2006). https://doi.org/10.1007/BF02704501

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  • DOI: https://doi.org/10.1007/BF02704501

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