  URu2Si2 presents superconductivity at temperatures below 1.5 K, and a hidden
order (HO) at about 17.5 K, both electronic phenomena are in uenced by Fano and
Kondo resonances. At 17.5 K the HO was related in the past to a Peierls
distortion that produces an energy gap deformed by the resonances. This order
has been studied by more than 20 years, still without a clear understanding. In
this work we studied the electronic characteristics of URu2Si2 in a single
crystal, with tunneling and metallic point contact spectroscopies. In the
superconducting state, we determined the energy gap, which shows the in uence
of the Fano and Kondo resonances. At temperatures where HO is observed, the
tunnel junctions spectra show the in uence of the two resonances. Tunnel
junctions characteristics show that the Fermi surface nesting depends on the
crystallographic direction.
