Electronic structure and physical properties of EuAuAs single crystal

High-quality single crystals of EuAuAs were studied by means powder x-ray diffraction, magnetization, magnetic susceptibility, heat capacity, electrical resistivity and magnetoresistance measurements. The compound crystallizes with a hexagonal structure the ZrSiBe type (space group $P{6}_{3}/mmc$). It orders antiferromagnetically below 6 K due to moments divalent Eu ions. exhibits metallic behavior down 40 K, followed sharp increase at low temperatures. magnetotransport isotherms show distinct metamagneticlike transition in concert magnetization data. antiferromagnetic ground state was corroborated ab initio electronic band calculations. Most remarkably, calculations revealed presence nodal line without spin-orbit coupling Dirac point inclusion coupling. $Z{}_{2}$ invariants under effective time reversal inversion symmetries make this system nontrivial topological material. Our findings, combined experimental analysis, makes plausible candidate for an nodal-line semimetal.