Observation of interband pairing interaction in a two-band superconductor: MgB2 |
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Authors: | Geerk J Schneider R Linker G Zaitsev A G Heid R Bohnen K-P v Löhneysen H |
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Institution: | Forschungszentrum Karlsruhe, Institut für Festk?rperphysik, P.O.B. 3640, D-76021 Karlsruhe, Germany. |
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Abstract: | The recently discovered anisotropic superconductor MgB2 is the first of its kind showing the intriguing properties of two-band superconductivity. By tunneling experiments using thin film tunnel junctions, electron-coupled phonon spectra were determined showing that superconductivity in MgB2 is phonon mediated. In a further analysis, which involves first principles calculations, the strongest feature in these spectra could be traced back to the key quantity of two-band superconductivity, the interband pairing interaction. For the phonons, this interaction turns out quite selective. It involves mainly low-energy optical phonon modes, where the boron atoms move perpendicular to the boron planes. |
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