Figure 1

(a),(b) Off- and on-resonance, respectively, valence band structure near the $\Gamma$ point of ${\mathrm{URu}}_2{\mathrm{Si}}_2$ at 10 K with 92 eV ($k_z$ slightly below $\Gamma$) and 98 eV ($k_z$ slightly above $\Gamma$), measured along the (1, 0, 0) direction. (c) The intensity difference between on- and off-resonance valence band structure. Blue color depicts decrease of spectral weight, while red denotes increased spectral weight. Top panels of (a)–(c) show the integrated EDCs.Reuse & Permissions

Figure 2

Fermi surface mapping in the $k_x$-$k_y$ plane ($k_z=0$) of ${\mathrm{URu}}_2{\mathrm{Si}}_2$ in the HO state. (a)–(c) Constant-energy contours of the band structure at the $E_F$, and at 100 and 300 meV below $E_F$, integrated over 10 meV. Two components of the DFT-computed paramagnetic Fermi surface sections $k_z=0$ and $k_z=Z$ planes of the simple-tetragonal BZ are shown in light green and light blue, respectively, and serve as guide for the eyes. (d) Cross section of the calculated antiferromagnetic (AFM) Fermi surface in the $k_z=0$ plane, adapted from Ref. 24. (e) DFT band dispersions of ${\mathrm{URu}}_2{\mathrm{Si}}_2$ in the PM and AFM phases plotted in the st BZ, adapted from Ref. 29.Reuse & Permissions

Figure 3

Temperature evolution of MDCs of ${\mathrm{URu}}_2{\mathrm{Si}}_2$ integrated over the ($-5$, 5) meV range near $E_F$ along the (1, 1, 0) direction, taken with 98 eV photons at the $5d–5f$ resonance. (a) MDC at 10 K in the HO in red, MDC in the normal state at 35 K in green, and the difference shown in blue. Four momentum locations marked 1 to 4 are indicated in the inset. (b) EDC cuts at the four momentum values, for two temperatures, and their difference.Reuse & Permissions

Figure 4

Normal emission ARPES study of ${\mathrm{URu}}_2{\mathrm{Si}}_2$ in the HO state. (a) Schematic model of the 3D FS in the PM phase. (b) Experimental 3D FS map of the Fermi level intensity constructed out of 89 $E_F$ cuts along $k_z$ measured with $h\nu =14–34\mathrm{eV}$ photons in 250 meV steps, in the $\Gamma$-$X$-$Z$ plane, indicated by black lines in (a). DFT calculated Fermi contours (solid gray lines) [24] and final state arcs for different photon energies (thin magenta lines) are indicated. The dashed magenta lines and dashed green circles present the nesting vectors and hot spots, respectively. (c) Second derivation plot of the normal emission given in (b). (d),(e) Enlarged views of the hot spots indicated in (c). (f) Intensity cut corresponding to the dashed black line in (c).Reuse & Permissions