A. V. Pogrebnyakov

In situ epitaxial MgB2 thin films for superconducting electronics

The newly discovered 39-K superconductor MgB21 holds great promise for superconducting electronics. Like the conventional superconductor Nb, MgB2 is a phonon-mediated superconductor2, with a relatively long coherence length3. These properties make the prospect of fabricating reproducible uniform Josephson junctions, the fundamental element of superconducting circuits, much more favourable for MgB2 than for high-temperature superconductors. The higher transition temperature and larger energy gap4,5 of MgB2 promise higher operating temperatures and potentially higher speeds than Nb-based integrated circuits. However, success in MgB2 Josephson junctions has been limited because of the lack of an adequate thin-film technology6,7. Because a superconducting integrated circuit uses a multilayer of superconducting, insulating and resistive films, an in situ process in which MgB2 is formed directly on the substrate is desirable. Here we show that this can be achieved by hybrid physical–chemical vapour deposition. The epitaxially grown MgB2 films show a high transition temperature and low resistivity, comparable to the best bulk samples, and their surfaces are smooth. This advance removes a major barrier for superconducting electronics using MgB2.

High-field superconductivity in alloyed MgB 2 thin films

We investigated the effect of alloying on the upper critical field

Superconducting MgB2 thin films on silicon carbide substrates by hybrid physical–chemical vapor deposition

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Thickness dependence of the properties of epitaxial MgB2 thin films grown by hybrid physical-chemical vapor deposition

in 12

Properties of MgB2 thin films with carbon doping

MgB_2

Critical current density and resistivity of MgB2 films

films, in which disorder was introduced by growth, carbon doping or He-ion irradiation, finding a significant

High upper critical field and irreversibility field in MgB2 coated-conductor fibers

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SQUID magnetometer operating at 37K based on nanobridges in epitaxial MgB2 thin films

enhancement in C-alloyed films, and an anomalous upward curvature of

Effect of damage by 2MeV He ions on the normal and superconducting properties of magnesium diboride

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Quantitative mapping of phase coexistence in Mott-Peierls insulator during electronic and thermally driven phase transition.

. Record high values of