Abstract
We report on the observation of the Josephson effect on the newlydiscovered superconductor MgB2 with the break-junction technique. Similarto conventional superconductors, the I-V curve can be fittedwith the resistively shunted junction model including the noise effect, anda large characteristic voltage Vc = IcRN =9.6 meV was obtained. The energy gap determined by theAmbegaokar-Baratoff relation with the fitted Vc is very consistentwith the Bardeen-Cooper-Schrieffer weak-coupling value. Our resultimplies that the superconductor MgB2 is a promising material forJosephson device applications.
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