The Josephson effect in the superconductor was studied by using the break-junction technique. Similarly to conventional superconductors, the I-V curve could be fitted by using a resistively shunted junction model, including the noise effect. A large characteristic voltage of VC = ICRN = 9.6meV was obtained. The energy gap determined by the Ambegaokar-Baratoff relationship, and the fitted VC, was consistent with the Bardeen-Cooper-Schrieffer weak-coupling value.

Josephson Effect in MgB2 - Large ICRN Product and Superconducting Energy Gap. Y.Xuan, Z.Z.Li, H.J.Tao, Z.A.Ren, G.C.Che, B.R.Zhao, Z.X.Zhao: Chinese Physics Letters, 2001, 18, 1254-5