Fermiology and electron-phonon coupling in the 2H and 3R polytypes of NbS${}_2$

Abstract

We investigate the electronic structure of the 2H and 3R polytypes of NbS${}_2$. The Fermi surfaces measured by angle-resolved photoemission spectroscopy show a remarkable difference in size, reflecting a significantly increased band filling in 3R-Nb${}_{1+x}$S${}_2$ compared to 2H-NbS${}_2$, which we attribute to the presence of additional interstitial Nb which act as electron donors. Thus we find that the stoichiometry, rather than the stacking arrangement, is the most important factor in the difference in electronic and physical properties of the two phases. Our high resolution data on the 2H phase shows kinks in the spectral function that are fingerprints of the electron-phonon coupling. However, the strength of the coupling is found to be much larger for the the sections of bands with Nb 4$d_{x^2-y^2,xy}$ character than for the Nb 4$d_{3z^2-r^2}$. Our results provide an experimental framework for interpreting the two-gap superconductivity and "latent" charge density wave in 2H-NbS${}_2$.

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Cited by in corpus (11)

• Role of intercalated Cobalt in the electronic structure of Co${}_{1/3}$NbS${}_2$
• Visualizing the out-of-plane electronic dispersions in an intercalated transition metal dichalcogenide
• Comparative Electronic Structures of the Chiral Helimagnets Cr1/3NbS2 and Cr1/3TaS2
• Stacking effect and Coulomb correlation in layered charge density wave phase of 1T-NbS2
• Unidirectional Kondo scattering in layered NbS2
• Electronic transport and magnetism in the alternating stack of metallic and highly frustrated magnetic layers in Co${}_{1/3}$NbS${}_2$
• Probing the interlayer coupling in 2$H$-NbS${}_2$ via soft x-ray angle-resolved photoemission spectroscopy
• Negative differential resistance state in the free-flux-flow regime of driven vortices in a single crystal of 2H-NbS${}_2$
• Pressure-Induced Enhancement of Superfluid Density in Transition Metal Dichalcogenides with and without Charge Density Wave
• Tunable Octdong and Spindle-Torus Fermi Surfaces in Kramers Nodal Line Metals
• Discovery of Van Hove Singularities: Electronic Fingerprints of 3Q Magnetic Order in a van der Waals Quantum Magnet