Point-contact spectroscopy of magnesium diboride with different counter-electrodes

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dc.creatorD'yachenko, A. I.
dc.creatorTarenkov, V. Yu.
dc.creatorBelogolovskii, M. A.
dc.creatorVaryukhin, V. N.
dc.creatorAbal'oshev, A. V.
dc.creatorLewandowski, S. J.
dc.date2004-01-23
dc.date.accessioned2026-07-07T02:56:04Z
dc.date.available2026-07-07T02:56:04Z
dc.descriptionWe report on tunneling and Andreev-reflection conductance spectra of 39 K superconducting magnesium diboride, obtained with Pb and Au counter-electrodes. Two distinct steps at close to 2.7 and 7.1 meV appear in a low-resistance metallic-type Au-MgB2 junction characteristic, whereas a tunneling-like spectrum measured for the same junction, annealed by the application of dc current, exhibits only a rounded contribution of the larger gap. Junctions with a superconducting lead counter-electrode pressed into a bulk MgB2 sample reveal two conductance peaks that are interpreted as the result of the formation of highly-transmitting break junctions inside the magnesium diboride ceramic. Our results strongly support the two-band model with two different gap values on quasi-two-dimensional σ(7.1 meV) and three-dimensional π(2.7 meV) Fermi surface sheets of MgB2.
dc.description12 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0401473
dc.identifierhttp://arxiv.org/abs/cond-mat/0401473
dc.identifierMod. Phys. Lett. B 17, 1405 (2003)
dc.identifierdoi:10.1142/S0217984903006505
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/23176
dc.subjectSuperconductivity
dc.titlePoint-contact spectroscopy of magnesium diboride with different counter-electrodes
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