The determination of the electron-phonon interaction from tunneling data in the two-band superconductor MgB2
D. Daghero, R. S. Gonnelli, G. A. Ummarino, O. V. Dolgov, J. Kortus, A. A. Golubov, S. V. Shulga
Abstract
We calculate the tunneling density of states (DOS) of MgB2 for different tunneling directions, by directly solving the real-axis, two-band Eliashberg equations (EE). Then we show that the numeric inversion of the standard single-band EE, if applied to the DOS of the two-band superconductor MgB2, may lead to wrong estimates of the strength of certain phonon branches (e.g. the E2g) in the extracted electron-phonon spectral function alpha(2)F(omega). The fine structures produced by the two-band interaction turn out to be clearly observable only for tunneling along the ab planes in high-quality single crystals. The results are compared to recent experimental data.
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