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arXiv · 2208.10405

Electronic structure and physical properties of EuAuAs single crystal

S. Malick·J. Singh·A. Laha·V. Kanchana·Z. Hossain·D. Kaczorowski
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Abstract

High-quality single crystals of EuAuAs were studied by means of powder x-ray diffraction, magnetization, magnetic susceptibility, heat capacity, electrical resistivity and magnetoresistance measurements. The compound crystallizes with a hexagonal structure of the ZrSiBe type (space group $P6_3/mmc$). It orders antiferromagnetically below 6 K due to the magnetic moments of divalent Eu ions. The electrical resistivity exhibits metallic behavior down to 40 K, followed by a sharp increase at low temperatures. The magnetotransport isotherms show a distinct metamagnetic-like transition in concert with the magnetization data. The antiferromagnetic ground state in \mbox{EuAuAs} was corroborated in the \textit{ab initio} electronic band structure calculations. Most remarkably, the calculations revealed the presence of nodal line without spin-orbit coupling and Dirac point with inclusion of spin-orbit coupling. The \textit{Z}$_2$ invariants under the effective time reversal and inversion symmetries make this system nontrivial topological material. Our findings, combined with experimental analysis, makes EuAuAs a plausible candidate for an antiferromagnetic topological nodal-line semimetal.

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S. Malick, J. Singh, A. Laha, V. Kanchana, Z. Hossain, D. Kaczorowski. 2022-08-22. Electronic structure and physical properties of EuAuAs single crystal. https://doi.org/10.1103/physrevb.105.045103

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