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

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...

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Detalles Bibliográficos
Autores principales: Daghero, D, Gonnelli, R S, Ummarino, G A, Dolgov, O V, Kortus, J, Golubov, A A, Shulga, S V
Lenguaje:eng
Publicado: 2003
Materias:
Condensed Matter
Acceso en línea:https://dx.doi.org/10.1088/0264-9381/20/21/006
http://cds.cern.ch/record/618089
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author Daghero, D
Gonnelli, R S
Ummarino, G A
Dolgov, O V
Kortus, J
Golubov, A A
Shulga, S V
author_facet Daghero, D
Gonnelli, R S
Ummarino, G A
Dolgov, O V
Kortus, J
Golubov, A A
Shulga, S V
author_sort Daghero, D
collection CERN
description 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.
id cern-618089
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2003
record_format invenio
spelling cern-6180892019-09-30T06:29:59Zdoi:10.1088/0264-9381/20/21/006http://cds.cern.ch/record/618089engDaghero, DGonnelli, R SUmmarino, G ADolgov, O VKortus, JGolubov, A AShulga, S VThe determination of the electron-phonon interaction from tunneling data in the two-band superconductor MgB2Condensed MatterWe 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.cond-mat/0305563oai:cds.cern.ch:6180892003-05-23
spellingShingle Condensed Matter
Daghero, D
Gonnelli, R S
Ummarino, G A
Dolgov, O V
Kortus, J
Golubov, A A
Shulga, S V
The determination of the electron-phonon interaction from tunneling data in the two-band superconductor MgB2
title The determination of the electron-phonon interaction from tunneling data in the two-band superconductor MgB2
title_full The determination of the electron-phonon interaction from tunneling data in the two-band superconductor MgB2
title_fullStr The determination of the electron-phonon interaction from tunneling data in the two-band superconductor MgB2
title_full_unstemmed The determination of the electron-phonon interaction from tunneling data in the two-band superconductor MgB2
title_short The determination of the electron-phonon interaction from tunneling data in the two-band superconductor MgB2
title_sort determination of the electron-phonon interaction from tunneling data in the two-band superconductor mgb2
topic Condensed Matter
url https://dx.doi.org/10.1088/0264-9381/20/21/006
http://cds.cern.ch/record/618089
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