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All magnesium diboride Josephson junctions with MgO and native oxide barriers

Source: Appl. Phys. Lett. 96, 082508 (2010); doi:10.1063/1.3332575

Published 25 February 2010

KEYWORDS and PACS
Keywords
PACS
  • 74.50.+r
    Superconductor tunneling phenomena; point contacts, weak links, Josephson effects
  • 74.25.Sv
    Critical currents in superconductors
  • 74.70.-b
    Superconducting materials
  • 74.62.-c
    Transition temperature variations (superconductivity)
  • 74.25.Jb
    Electronic structure of superconductors
  • YEAR: 2010
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PUBLICATION DATA
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M. V. Costache and J. S. Moodera
Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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. ©2010 American Institute of Physics
History: Received 20 December 2009; accepted 3 February 2010; published 25 February 2010
Permalink: http://link.aip.org/link/?APPLAB/96/082508/1

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