Superconducting Quantum Interference Device based on MgB2 nanobridges

Details Superconducting Quantum Interference Device based on MgB2 nanobridges Superconducting Quantum Interference Device based on MgB2 nanobridges

2001-05-28

arxiv.org/abs/cond-mat/0105535v1

Physics

Condensed Matter

Superconductivity

submitted to Appl. Phys. Lett

Scientific paper

10.1063/1.1407864

The recently discovered superconductor MgB2, with a transition temperature of 39K, has significant potential for future electronics. An essential step is the achievement of Josephson circuits, of which the superconducting quantum interference device (SQUID) is the most important. Here, we report Josephson quantum interference in superconducting MgB2 thin films. Modulation voltages of up to 30 microvolt are observed in an all-MgB2 SQUID, based on focused ion beam patterned nanobridges. These bridges, with a length scale < 100 nm, have outstanding critical current densities of 7 x 10^6 A/cm2 at 4.2 K.

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