Figure 1

Differential conductance vs voltage curves $G\left(V\right)$ of URu${}_2$Si${}_2$ at atmospheric pressure. A soft point contact is made on the $c$ axis. Curves at $T\le 56.5$ K have been shifted vertically for clarity and the corresponding temperatures are indicated next to each curve. The dashed lines are guides to the eye to show the evolutions of the side feature (outer set of dashed curves) and asymmetric peaks (inner set of dashed curves). Inset: The temperature-dependent zero-bias contact resistance $G_0^{-1}\left(T\right)$. The arrow indicates the local resistance maximum related to the side feature of $G\left(V\right)$.Reuse & Permissions

Figure 2

(a) Soft point-contact conductance spectra $G\left(V\right)$ of URu${}_2$Si${}_2$ at $T=2.0$ K under different pressures. The dashed lines are guides to eyes, indicating a weak increase of the peak positions with pressures while the asymmetric peaks persist into the LMAF state. (b) Temperature-dependent zero-bias contact resistance curves $G_0^{-1}\left(T\right)$ at different pressures. The curves are shifted vertically for clarity and the dashed line is a guide to eye to indicate the evolution of local resistance maxima under pressure. (c) The pressure phase diagram of URu${}_2$Si${}_2$ taken from Ref.13. The local zero-bias resistance maxima (stars) under pressure follow the pressure-dependent $T_{\mathrm{HO}}$ ($T_N$) line.Reuse & Permissions

Figure 3

Differential conductance vs voltage curves $G\left(V\right)$ for URu${}_2$Si${}_2$ at $P=1.62$ GPa, with LMAF order as the ground state at this pressure. Curves at $T\le 25.0$ K have been shifted vertically for clarity and the corresponding temperatures are labeled on the right-hand side. The dashed lines are guides to the eye to show the evolution of the side feature and asymmetric peaks.Reuse & Permissions