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24 April 2024

» arxiv » cond-mat/0305563

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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 ;
Date:	23 May 2003
Journal:	Physica C 408-410, 353 (2004)
Subject:	Superconductivity \| cond-mat.supr-con
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 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.
Source:	arXiv, cond-mat/0305563
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