Recent interest in quantum materials has focused on systems exhibiting both superconductivity and nontrivial band topology as material candidates to realize topological or unconventional superconducting states. So far, superconductivity in most topological materials has been identified as type II. In this work, we present magnetotransport studies on the quasi-two-dimensional type I superconductor ${\mathrm{YbSb}}_2$. Combined ab initio density functional theory calculations and quantum oscillation measurements confirm that ${\mathrm{YbSb}}_2$ is a Dirac nodal line semimetal in the normal state. The complex Fermi-surface morphology is evidenced by the nonmonotonic angular dependence of both the quantum oscillation amplitude and the magnetoresistance. Our results establish ${\mathrm{YbSb}}_2$ as a candidate material platform for exploring the interplay between band topology and superconductivity.

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• Fermi surface
• Nodal-line semimetals
• Topological materials
• Resistivity measurements
• Shubnikov-de Haas effect