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The Dirac nodal line (DNL) is a novel form of massless Dirac fermions thatreside along lines in momentum space. Here, we verify genuine DNLs in themolecular material, [Ni(dmdt)$_2$], with the combined NMR experiments andnumerical simulations. The NMR spectral shift and spin-lattice relaxation ratedivided by temperature, $1/T_1T$, decrease linearly and quadratically withtemperature, respectively, and become constant at low temperatures, consistentwith slightly dispersive DNLs with small Fermi pockets. Comparison of theseresults with model simulations of DNLs reveals the suppression of the Fermivelocity and the enhancement of antiferromagnetic fluctuations due to electroncorrelation as well as the influence of the Landau quantization. The presentstudy offers a demonstration to identify the DNL and evaluate the correlationeffect with NMR.

NMR verification of Dirac nodal lines in a single-component molecular conductor