Evidence of s-Wave Subdominant Order Parameter in YBCO from Break Junction Tunneling Spectra

A. I. Akimenko, F. Bobba, F. Giubileo +3

The tunneling spectra of YBa2Cu3O7 break-junctions have been investigated for the tunneling direction close to the node one. The zero-bias conductance peak (ZBCP) and Josephson cur…