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Enhanced electron correlations in the binary stannide <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="bold">PdSn</mml:mi><mml:mn mathvariant="bold">4</mml:mn></mml:msub></mml:math> : A homologue of the Dirac nodal arc semimetal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="bold">PtSn</mml:mi><mml:mn mathvariant="bold">4</mml:mn></mml:msub></mml:math>
The advent of nodal-line semimetals, i.e., systems in which the conduction and valence bands cross each other along a closed trajectory (line or loop) inside the Brillouin zone, has opened up a new arena for the exploration of topological condensed matter in which, due to a vanishing density of states …