The determination of the electron-phonon interaction from tunneling data in the two-band superconductor MgB2

Details The determination of the electron-phonon interaction from tunneling data in the two-band superconductor MgB2 The determination of the electron-phonon interaction from tunneling data in the two-band superconductor MgB2

2003-05-23

arxiv.org/abs/cond-mat/0305563v1

Physica C 408-410, 353 (2004)

Physics

Condensed Matter

Superconductivity

2 pages, 2 figures, proceedings of M2S-HTSC-VII conference, Rio de Janeiro (May 2003)

Scientific paper

10.1016/j.physc.2004.02.098

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 E_2g) 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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