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• W2168873721 abstract "We have studied the structure of the superconducting gap in MgB2 thin films by means of point-contact spectroscopy using a gold tip. The films were produced by depositing pure boron on a sapphire substrate, using e-beam evaporation, followed by reaction with magnesium vapour. The films have a Tc of 38.6 +- 0.3 K and resistivity of about 20 microOhm cm at 40 K. The point-contact spectra prove directly the existence of a multi-valued order parameter in MgB2, with two distinct values of the gap, DELTA1=2.3+-0.3 meV and DELTA2=6.2+-0.7 meV at 4.2 K. Analysis of the spectra in terms of the Blonder-Tinkham-Klapwijk model reveals that both gaps close simultaneously at the Tc of the film. Possible mechanisms that can explain the intrinsic co-existence of two values of the gap are discussed." @default.
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• W2168873721 date "2002-02-19" @default.
• W2168873721 modified "2023-09-27" @default.
• W2168873721 title "Structure of the superconducting gap in MgB₂from point-contact spectroscopy" @default.
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• W2168873721 doi "https://doi.org/10.1088/0953-2048/15/4/308" @default.
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