Figure 2

Temperature and field dependent differential conductance (dI/dV) of Au/SrRuO₃/Sr₂RuO₄ Junction J4. (a) dI/dV measured at different temperatures between 1.4 K and 0.3 K. At 0.3 K a flat-top central conductance peak appears between ±V₃. Note that there are additional oscillations with the minima at V₁^* and V₂^*. At temperatures above 1.1 K, another transition at ±V₂ becomes visible within the range of bias voltage. (b) Temperature dependence of all characteristic voltages appeared in dI/dV data. (c) dI/dV at various temperatures. The data are shifted with a step of 10 m Ω⁻¹ but for 1.2 K and 1.3 K are shifted with 30 m Ω⁻¹ for clarity. dI/dV as a function of magnetic field applied along (d) the in-plane and (e) the out-of-plane (c-axis) directions. Data are shifted for clarity.