Abstract
Electron-tunneling measurements on the new superconductor MgB 2 with T c=39 K have been carried out using a break-junction technique. The measurements reveal the largest gap value of 2 Δ=17–19 meV at 4.2 K. This value leads to the ratio 2 Δ/ k B T c=5–5.6, indicating the strong-coupling superconductivity. We have also observed the reproducible gap values of 2 Δ≅4–4.5 meV and 7–9 meV. The smallest gap exists even beyond 30 K. We will discuss the implication of the data.
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