Josephson effect in MgB_2 break junctions

Details Josephson effect in MgB_2 break junctions Josephson effect in MgB_2 break junctions

2001-05-11

arxiv.org/abs/cond-mat/0105241v1

Phys. Rev. Lett. 87, 097001 (2001)

Physics

Condensed Matter

Superconductivity

4 RevTEX pages, 4 eps figures

Scientific paper

10.1103/PhysRevLett.87.097001

We present the first observation of the DC and AC Josephson effect in MgB_2 break junctions. The junctions, obtained at 4.2 K in high-quality, high-density polycrystalline metallic MgB_2 samples, show a non-hysteretic DC Josephson effect. By irradiating the junctions with microwaves we observe clear Shapiro steps spaced by the ideal $\Delta V$ value. The temperature dependence of the DC Josephson current and the dependence of the height of the steps on the microwave power are obtained. These results are a direct prove for the existence of pairs with charge 2e in this new metallic superconductor and give evidence of the superconductor-normal metal-superconductor weak link character of these junctions.

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