All-MgB2 Josephson tunnel junctions

Abstract

Sandwich-type all-MgB2 Josephson tunnel junctions (MgB2/AlOx/MgB2) have been fabricated for the first time with as-grown MgB2 films formed by molecular beam epitaxy. The junctions exhibit substantial superconducting current (IcRN product ~ 0.8 mV at 4.2K), a well-defined superconducting gap (delta = ~2.3 mV), and clear Fraunhofer patterns. The superconducting gap voltage of delta agrees well with the smaller gap in the multi-gap scenario. The results demonstrate that MgB2 has great promise for superconducting electronics that can be operated at T ~ 20 K.

9 pages, 3 figures

References in corpus (13)

• Beyond Eliashberg superconductivity in MgB2: anharmonicity, two-phonon scattering, and multiple gaps
• Evidence for two superconducting energy gaps in MgB2 by point-contact spectroscopy
• Specific Heat of Mg ^{11}B_2
• Two Gap State Density in MgB${}_2$: A True Bulk Property or A Proximity Effect?
• Two-Band Superconductivity in MgB2
• Multiband model for tunneling in MgB2 junctions
• Evidence for Two Superconducting Gaps in $Mg{B}_2$
• Direct evidence for a multiple superconducting gap in MgB2 from high-resolution photoemission spectroscopy
• Superconducting Quantum Interference Device based on MgB2 nanobridges
• In-situ growth of superconducting MgB2 thin films by molecular beam epitaxy
• Planar Superconductor-Normal-Superconductor Josephson Junctions in MgB2
• Josephson effect in MgB_2 break junctions
• MgB2 tunnel junctions and 19 K low-noise dc superconducting quantum interference devices

Cited by in corpus (7)

• Proximity and Josephson effects in microstructures based on multiband superconductors
• MgB2 tunnel junctions with native or thermal oxide barriers
• Subharmonic gap structures and Josephson effect in MgB2/Nb micro-constrictions
• All Magnesium diboride Josephson Junctions with MgO and native oxide barriers
• Transfer-matrix approach to multiband Josephson junctions
• Properties of MgB2 Films Grown at Various Temperatures by Hybrid Physical-Chemical Vapour Deposition
• Classification of magnetic inhomogeneities and $0-\pi$ transitions in superconducting-magnetic hybrid structures