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Magnetic topological semimetals (TSMs) allow for an effective control of thetopological electronic states by tuning the spin configuration, and thereforeare promising materials for next-generation electronic and spintronicapplications. Of magnetic TSMs, Weyl nodal-line (NL) semimetals likely have themost tunability, and yet they are the least experimentally studied so far dueto the scarcity of material candidates. Here, using a combination ofangle-resolved photoemission spectroscopy and quantum oscillation measurements,together with density functional theory calculations, we identify thesquare-net compound EuGa4 as a new magnetic Weyl nodal ring (NR) semimetal, inwhich the line nodes form closed rings in the vicinity of the Fermi level.Remarkably, the Weyl NR states show distinct Landau quantization with clearspin splitting upon application of a magnetic field. At 2 K in a field of 14 T,the transverse magnetoresistance of EuGa4 exceeds 200,000%, which is more thantwo orders of magnitude larger than that of other known magnetic TSMs. Highfield magnetoresistance measurements indicate no saturation up to 40 T. Ourtheoretical model indicates that the nonsaturating MR naturally arises as aconsequence of the Weyl NR state. Our work thus point to the realization ofWeyl NR states in square-net magnetic materials, and opens new avenues for thedesign of magnetic TSMs with very large magnetoresistance.

Weyl nodal ring states and Landau quantization with very large magnetoresistance in square-net magnet EuGa$_4$