The CoSbTe single crystal has been investigated using ab initio first-principles calculations, magnetic, heat capacity, magnetotransport, neutron diffraction, and Mössbauer measurements. Density functional theory calculations reveal band inversion with nodal-line semimetal-like crossings near the Fermi level, while surface spectral functions confirm topological surface states, evidencing a nontrivial bulk topology. Magnetic measurements of CoSbTe exhibit a nonmagnetic ground state along with trace paramagnetic impurities of ${\mathrm{Co}}^{2+}$ ions. Neutron diffraction and Mössbauer investigation also confirm the absence of any long or short range magnetic ordering above the liquid helium temperature. The electrical resistivity exhibits metallic behavior with large residual resistivity and low residual resistivity ratio. In low temperature range, resistivity dependency on temperature reveals deviation from conventional metallic $T^2$ characteristics due to presence of massive defect in the system. Transverse magnetoresistance measurements reveal a small, nonsaturating, and quasilinear field dependence. The Hall resistivity measurement indicates that the charge conduction in this compound is dominated by electrons. Our study establishes that CoSbTe is a topological nodal line semimetal candidate, making it a promising system for future exploration of topological phenomena and potential spintronic applications.

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• Electronic structure
• Magnetism
• Magnetotransport
• Spin-orbit coupling
• Nodal-line semimetals
• Topological materials
• Density functional calculations
• Magnetization measurements
• Mössbauer spectroscopy
• Neutron diffraction
• Resistivity measurements
• Specific heat measurements