Study of the pairing symmetry in the electron-doped cuprate by tunneling spectroscopy

Abstract: We performed Point Contact Andreev Reflection Spectroscopy experiments on crystals. The variety of the measured spectra are all explained in terms of a modified BTK model considering a d-wave symmetry of the superconducting order parameter. We give an estimation of the energy gap and of the ratio . We measured the temperature evolution of the vs. V characteristics and we extracted a conventional BCS temperature dependence of the superconducting energy gap. Finally, in order to explain the conductance spectra showing higher voltage gap-like features we consider a model in which the formation of a Josephson junction in series with the Point Contact junction is realized due to the tip pressure. [ABSTRACT FROM AUTHOR]