Polytypism and Superconductivity in the NbS${}_2$ System

Abstract

We report on the phase formation and the superconducting properties in the NbS${}_2$ system. Specifically, we have performed a series of standardized solid-state syntheses in this system, which allow us to establish a comprehensive synthesis map for the formation of the two polytypes 2H-NbS${}_2$ and 3R-NbS${}_2$, respectively. We show that the identification of two polytypes by means of X-ray diffraction is not always unambiguous. Our physical property measurements on a phase-pure sample of 3R-NbS${}_2$, on a phase-pure sample of 2H-NbS${}_2$, and a mixed phase sample confirm earlier reports that 2H-NbS${}_2$ is a bulk superconductor and that 3R-NbS${}_2$ is not a superconductor above $T=$ 1.75 K. Our results clearly show that specific heat measurements, as true bulk measurements, are crucial for the identification of superconducting materials in this and related systems. Our results indicate that for the investigation of van-der-Waals materials great care has to be taken on choosing the synthesis conditions for obtaining phase pure samples.

https://pubs.rsc.org/en/content/articlelanding/2021/dt/d0dt03636f#!divAbstract

References in corpus (11)

• Strongly enhanced charge-density-wave order in monolayer NbSe${}_2$
• Superconductivity in Weyl Semimetal Candidate MoTe2
• Superconducting density of states and vortex cores of 2H-NbS2
• Ising Superconductivity and Quantum Phase Transition in Macro-Size Monolayer NbSe2
• Possible topologically non-trivial superconducting order parameter in type-II Weyl semimetal T_d-MoTe_2
• Magnetism in Semiconducting Molybdenum Dichalcogenides
• Polytypism, polymorphism and superconductivity in TaSe2-xTex
• Anharmonic suppression of Charge density wave in 2H-NbS${}_2$
• Traces of Charge Density Waves in NbS${}_2$
• Specific-heat measurements of superconducting NbS2 single crystal in an external magnetic field: Study on the energy gap structure
• Low-energy excitations in type-II Weyl semimetal Td-MoTe2 evidenced through optical conductivity

Cited by in corpus (10)

• Unidirectional Kondo scattering in layered NbS2
• Band structure, superconductivity and polytypism in AuSn${}_4$
• Chemical Principles of Intrinsic Topological Superconductors
• Charting the landscape of Bardeen-Cooper-Schrieffer superconductors in experimentally known compounds
• Engineering two-dimensional materials from single-layer NbS${}_2$
• Investigating the superconducting state of 2$H$-NbS${}_2$ as seen by the vortex lattice
• Discovery of Superconductivity in Nb${}_4$SiSb${}_2$ with a V${}_4$SiSb${}_2$-Type Structure and Implications of Interstitial Doping on its Physical Properties
• Negative differential resistance state in the free-flux-flow regime of driven vortices in a single crystal of 2H-NbS${}_2$
• Revisiting the physical properties of (LaS)1+d(NbS2) misfit-layered compounds
• Magnetism in $M_{1/3}$NbS${}_2$ ($M$ = Fe, V, Mn): insight into intercalated transition-metal dichalcogenides using $\mu$SR