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

The Dirac nodal line (DNL) is a novel form of massless Dirac fermions that reside along lines in momentum space. Here, we verify genuine DNLs in the molecular material, [Ni(dmdt)\(_2\)], with the combined NMR experiments and numerical simulations. The NMR spectral shift and spin-lattice relaxation r...

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Bibliographic Details
Published inarXiv.org
Main Authors Sekine, Takahiko, Sunami, Keishi, Hatamura, Takumi, Miyagawa, Kazuya, Akimoto, Kenta, Zhou, Biao, Ishibashi, Shoji, Kobayashi, Akiko, Kanoda, Kazushi
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 28.12.2022
Subjects
Antiferromagnetism
Conductors
Fermions
Low temperature
Mathematical models
NMR
Nuclear magnetic resonance
Spin-lattice relaxation
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Summary:The Dirac nodal line (DNL) is a novel form of massless Dirac fermions that reside along lines in momentum space. Here, we verify genuine DNLs in the molecular material, [Ni(dmdt)\(_2\)], with the combined NMR experiments and numerical simulations. The NMR spectral shift and spin-lattice relaxation rate divided by temperature, \(1/T_1T\), decrease linearly and quadratically with temperature, respectively, and become constant at low temperatures, consistent with slightly dispersive DNLs with small Fermi pockets. Comparison of these results with model simulations of DNLs reveals the suppression of the Fermi velocity and the enhancement of antiferromagnetic fluctuations due to electron correlation as well as the influence of the Landau quantization. The present study offers a demonstration to identify the DNL and evaluate the correlation effect with NMR.
ISSN:2331-8422