Abstract
Electron-tunneling measurements on the superconductor MgB2 with Tc=39 K have been carried out using a break-junction technique. We have observed the double-gap structures with several combinations of the gap sizes. The largest Δ=9 meV gap can be observed as a single gap, which gives very strong-coupling ratio 2Δ/kBTc=5.3–5.7.
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