Topological properties of non-centrosymmetric superconductors IrB (=Nb, Ta)
arXiv:2012.15204 · doi:10.1103/PhysRevB.103.125154
Abstract
A recent experiment reported two new non-centrosymmetric superconductors NbIrB and TaIrB with respective superconducting transition temperatures of 7.2 K and 5.2 K and further suggested their superconductivity to be unconventional [K. Górnicka \textit{et al}., Adv. Funct. Mater. 2007960 (2020)]. Here, based on first-principles calculations and symmetry analysis, we propose that IrB (=Nb, Ta) are topological Weyl metals in the normal state. In the absence of spin-orbit coupling (SOC), we find that NbIrB has 12 Weyl points, and TaIrB has 4 Weyl points, i.e. the minimum number under time-reversal symmetry; meanwhile, both of them have a nodal net composed of three nodal lines. In the presence of SOC, a nodal loop on the mirror plane evolves into two hourglass Weyl rings, along with the Weyl points, which are dictated by the nonsymmorphic glide mirror symmetry. Besides the rings, NbIrB and TaIrB have 16 and 20 pairs of Weyl points, respectively. The surface Fermi arcs are explicitly demonstrated. On the (110) surface of TaIrB, we find extremely long surface Fermi arcs (0.6 ) located 1.4 meV below the Fermi level, which should be readily probed in experiment. Combined with the intrinsic superconductivity and the nontrivial bulk Fermi surfaces, IrB may thus provide a very promising platform to explore the three-dimensional topological superconductivity.
arXiv comment8 pages, 5 figures, 2 tables
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