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Interband Pairing Interaction in Magnesium Diboride Probed by Tunneling Spectroscopy

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Abstract:

We report on the study of the interband pairing interaction in the two-band superconductor MgB2 by tunneling spectroscopy using thin film tunnel junctions. The films were deposited in situ by an approach comprising a conventional planar B sputter gun and a special homemade Mg evaporator providing a high vapor pressure. For the tunneling experiments sandwich-type crossed-strip tunnel junctions with a native MgB2 oxide as the potential barrier and Al, In or Pb counterelectrodes were prepared. Voltage-dependent differential conductance measurements revealed estimates of the barrier thickness and height of 1.5 nm and 1.6 eV, respectively, and allowed us to determine the phonon-induced structures in the tunneling density of states of the phonon-mediated superconductor MgB2. The analysis of the reduced density of states using the standard single-band Eliashberg equations yielded an effective electron-phonon spectral function accounting for the smaller energy gap. A further analysis involving ab-initio LDA calculations and the two-band Eliashberg equations revealed that the dominant feature in the effective spectral function, a strong peak at 58 meV, was mainly due to the interband pairing interaction.

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Periodical:

Advances in Science and Technology (Volume 47)

Pages:

69-74

DOI:

https://doi.org/10.4028/www.scientific.net/AST.47.69

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Online since:

October 2006

Authors:

Rudolf Schneider, Jochen Geerk, Alexander G. Zaitsev, Rolf Heid, K.P. Bohnen, H. von Löhneysen

Keywords:

Phonons, Superconducting Film, Tunneling Phenomena

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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