Josephson Effect in MgB2: Large IcRN Product and Superconducting Energy Gap
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Abstract
We report the observation of the Josephson effect on the newly
discovered superconductor MgB2 with break-junction technique. Similar to the conventional superconductors, the I - V curve can be fitted with the resistively shunted junction model including the noise effect, and a large characteristic voltage Vc = IcRN = 9.6 meV was obtained. The energy gap determined by the Ambegaokar-Baratoff relation with the fitted Vc is consistent with the Bardeen-Cooper-Schrieffer weak-coupling value well. Our result implies that the superconductor MgB2 is a promising material for the Josephson device applications.
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