Fig. 1. Crystal structure and theoretical calculations of UCo_0.8Ru_0.2Al.

(A) Crystal structure of UCo_{1 − x}Ru_xAl. Left: The unit cell of UCoAl viewed from the [111] direction. A Co atom is replaced by a Ru atom upon doping. Right: The top view of UCoAl. The solid bonds indicate the tilted kagome layer formed by uranium atoms. (B) Density of states (DOS) including partial DOS for UCo_0.8Ru_0.2Al. (C) Nodal lines and Weyl points within ±60 meV of the Fermi energy in UCo_0.8Ru_0.2Al. For clarity, Weyl pairs with a k_z separation < 0.2 2π/c are not shown. (D) Band plots for examples of (i) type I, (ii) type II, and (iii) critically tilted Weyl points (red circles), identified with arrows in (C), plotted on the interval −2k_W < k_z < 2k_W, where 2k_W is the Weyl pair separation along the k_z direction.