Cucolo, A.M.; Bobba, F.; Giubileo, F.; Roditchev, D. - In: Physica A: Statistical Mechanics and its Applications 339 (2004) 1, pp. 112-118
We have performed an extensive scanning tunneling spectroscopy study on different MgB2 samples. In the standard N–I–S geometry on powders, we observed spectra characterized by pronounced double gap structures that can be modeled by supposing two independent tunneling channels, with gap...