Abstract
The tunneling spectra of YBa2Cu3O7−δ break junctions have been investigated for tunneling close to the node direction. The behavior of the zero-bias conductance peak (ZBCP) and the Josephson current have been studied as a function of the temperature and magnetic field. The deep splitting of the ZBCP is observed starting at TS<20–30K in agreement with the dx2−y2±is order parameter theory [Y. Tanuma, Y. Tanaka, S. Kashiwaya, Phys. Rev. B 64, 214519 (2001)]. We have observed that a low (0.04T) magnetic field significantly suppresses such splitting. The 1∕T temperature dependence of the maximum Josephson current going to saturation at T<TS also confirms mixed order parameter formation.
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