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The silicide superconductors (Ta, Nb, Zr)OsSi are among the best candidatematerials for investigating the interplay of topological order andsuperconductivity. Here, we investigate in detail the normal-state topologicalproperties of (Ta, Nb, Zr)OsSi, focusing on ZrOsSi, by employing a combinationof $^{29}$Si nuclear magnetic resonance (NMR) measurements and first-principlesband-structure calculations. We show that, while (Ta, Nb)OsSi behave as almostideal metals, characterized by weak electronic correlations and a relativelylow density of states, the replacement of Ta (or Nb) with Zr expands thecrystal lattice and shifts ZrOsSi towards an insulator. Our ab initiocalculations indicate that ZrOsSi is a $Z_2$ topological metal with clearsurface Dirac cones and properties similar to a doped strong topologicalinsulator.

ZrOsSi: A $Z_2$ topological metal with a superconducting ground state