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• W2017869021 abstract "Superconducting microconstrictions between Nb tips and high-quality $mathrm{Mg}{mathrm{B}}_{2}$ pellets have been realized by means of a point-contact inset, driven by a micrometric screw. Measurements of the current-voltage characteristics and of the dynamical conductance versus bias have been performed in the temperature range between $4.2phantom{rule{0.3em}{0ex}}mathrm{K}$ and $500phantom{rule{0.3em}{0ex}}mathrm{K}$. Above the Nb critical temperature ${T}_{C}^{mathit{Nb}}$, the conductance of the $mathrm{Mg}{mathrm{B}}_{2}$/normal-metal constrictions behaves as predicted by the Blonder-Tinkham-Klapwijk model for low-resistance contacts while high-resistance junctions show quasiparticle tunneling characteristics. Consistently, from the whole set of data we infer the value ${ensuremath{Delta}}_{ensuremath{pi}}=2.5ifmmodepmelsetextpmfi{}0.2phantom{rule{0.3em}{0ex}}mathrm{meV}$ for the three-dimensional (3D) gap of $mathrm{Mg}{mathrm{B}}_{2}$. Below ${T}_{C}^{mathit{Nb}}$, low-resistance contacts show Josephson current and subharmonic gap structures, due to multiple Andreev reflections. Simultaneous observations of both features unambiguously indicate a coupling of the 3D band of $mathrm{Mg}{mathrm{B}}_{2}$ with the Nb superconducting order parameter. We found that the temperature dependence of the Josephson critical current follows the classical Ambegaokar-Baratoff behavior with a value ${I}_{C}{R}_{N}=(2.1ifmmodepmelsetextpmfi{}0.1)phantom{rule{0.3em}{0ex}}mathrm{meV}$ at low temperatures." @default.
• W2017869021 created "2016-06-24" @default.
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• W2017869021 date "2005-11-23" @default.
• W2017869021 modified "2023-09-25" @default.
• W2017869021 title "Subharmonic gap structures and Josephson effect in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi mathvariant=normal>Mg</mml:mi><mml:msub><mml:mi mathvariant=normal>B</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mo>∕</mml:mo><mml:mi mathvariant=normal>Nb</mml:mi></mml:mrow></mml:math>microconstrictions" @default.
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• W2017869021 doi "https://doi.org/10.1103/physrevb.72.174518" @default.
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