In the present work we calculate for the first time the density of states of MgB2 for different tunneling directions by directly solving the two-band Eliashberg equations in the real-axis formulation starting from the first-principle calculation of the interband and intraband electron-phonon spectral functions. This complicated numeric procedure allows preserving the fine structures of the DOS in the phonon energy range. We show that the numeric inversion of the standard single-band Eliashberg equations when applied to the densities of states obtained by the two-band model may lead to artifacts in the extracted electron-phonon spectral function α2 F(ω). We also suggest that the small DOS structures produced by the two-band inter-action at energies between 20 and 100 meV can be observed only at very low temperature in junctions in perfect clean limit.
|Titolo:||Electron-phonon spectral function and two-band model in tunneling measurement on MgB2|
|Data di pubblicazione:||2003|
|Digital Object Identifier (DOI):||10.1142/S0217979203016364|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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