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We present results on all-MgB2 tunnel junctions, where the tunnel barrier isdeposited MgO or native-oxide of base electrode. For the junctions with MgO,the hysteretic I-V curve resembles a conventional underdamped Josephsonjunction characteristic with critical current-resistance product nearlyindependent of the junction area. The dependence of the critical current withtemperature up to 20 K agrees with the [Ambegaokar and Baratoff, Phys. Rev.Lett. 10, 486 (1963)] expression. For the junctions with native-oxide,conductance at low bias exhibits subgap features while at high bias revealsthick barriers. As a result no supercurrent was observed in the latter, despitethe presence of superconducting-gaps to over 30 K.

All Magnesium diboride Josephson Junctions with MgO and native oxide barriers