Probing superconductivity in Sr2RuO4 by point-contact spectroscopy

摘要

We present calculations of the surface conductance and compare results with point-contact spectroscopy experiments for current injection in the ah-plane. Two distinctly different types of dV/dI versus V spectra are observed: (i) a typical double-minimum structure which is seen in many superconductors, and (ii) a single-minimum structure centered at zero bias. These results call be consistently explained with a metallic point contact realized in (i) and with a tunneling contact in(ii). (C) 2000 Elsevier Science B.V. All rights reserved. [References: 8]