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

D. Daghero; R.S. Gonnelli; G.A. Ummarino; O.V. Dolgov; J. Kortus; Alexandre Avraamovitch Golubov; S.V. Shulga

doi:10.1016/j.physc.2004.02.098

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

D. Daghero, R.S. Gonnelli, G.A. Ummarino, O.V. Dolgov, J. Kortus, Alexandre Avraamovitch Golubov, S.V. Shulga

Faculty of Science and Technology

Research output: Contribution to journal › Article › Academic › peer-review

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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 α2F(ω). 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.

Original language	Undefined
Pages (from-to)	353-
Journal	Physica C
Volume	408-410
DOIs	https://doi.org/10.1016/j.physc.2004.02.098
Publication status	Published - 2004

Keywords

Electron–phonon interaction
Eliashberg equations
METIS-218675
Magnesium diboride
IR-76364

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10.1016/j.physc.2004.02.098

Cite this

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title = "The determination of the electron-phonon interaction from tunneling data in the two-band",

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 α2F(ω). 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.",

keywords = "Electron–phonon interaction, Eliashberg equations, METIS-218675, Magnesium diboride, IR-76364",

author = "D. Daghero and R.S. Gonnelli and G.A. Ummarino and O.V. Dolgov and J. Kortus and Golubov, {Alexandre Avraamovitch} and S.V. Shulga",

year = "2004",

doi = "10.1016/j.physc.2004.02.098",

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journal = "Physica C",

issn = "0921-4534",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - The determination of the electron-phonon interaction from tunneling data in the two-band

AU - Daghero, D.

AU - Gonnelli, R.S.

AU - Ummarino, G.A.

AU - Dolgov, O.V.

AU - Kortus, J.

AU - Golubov, Alexandre Avraamovitch

AU - Shulga, S.V.

PY - 2004

Y1 - 2004

N2 - 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 α2F(ω). 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.

AB - 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 α2F(ω). 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.

KW - Electron–phonon interaction

KW - Eliashberg equations

KW - METIS-218675

KW - Magnesium diboride

KW - IR-76364

U2 - 10.1016/j.physc.2004.02.098

DO - 10.1016/j.physc.2004.02.098

M3 - Article

SN - 0921-4534

VL - 408-410

SP - 353-

JO - Physica C

JF - Physica C

ER -