All Magnesium diboride Josephson Junctions with MgO and native oxide barriers

Details All Magnesium diboride Josephson Junctions with MgO and native oxide barriers All Magnesium diboride Josephson Junctions with MgO and native oxide barriers

2010-03-16

arxiv.org/abs/1003.3158v1

Applied Physics Letters 96, 082508 (2010)

Physics

Condensed Matter

Superconductivity

8 pages with 3 figures

Scientific paper

10.1063/1.3332575

We present results on all-MgB2 tunnel junctions, where the tunnel barrier is deposited MgO or native-oxide of base electrode. For the junctions with MgO, the hysteretic I-V curve resembles a conventional underdamped Josephson junction characteristic with critical current-resistance product nearly independent of the junction area. The dependence of the critical current with temperature 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 reveals thick barriers. As a result no supercurrent was observed in the latter, despite the presence of superconducting-gaps to over 30 K.

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