Also called NbSe₂, 2H-NbSe₂, NbS₂
A metal that becomes a superconductor when cooled and stays one even as a single layer, which has made it the standard material for studying superconductivity in two dimensions. Because the spins of its electrons are locked by the crystal’s lack of inversion symmetry, a monolayer survives magnetic fields far beyond the usual limit for a superconductor. Its sulfur sibling 2H-NbS2 superconducts at a similar temperature but shows no charge density wave, so the pair separates the two effects.
They are coordination polyhedra. Only complete ones are drawn.
Three layers of 2H-NbSe2. Each layer is turned by 180° and shifted, so niobium sits directly over niobium – a different two-layer stacking from MoS2’s, where molybdenum sits over sulfur. c = 12.54 Å. Cell from Selte, Kjekshus and colleagues, Acta Chemica Scandinavica 18, 697 (1964); COD 1539310.
Readiness runs lab → prototype → pilot → deployed.
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The canonical Ising superconductor: broken inversion symmetry and spin–orbit coupling pin spins out of plane with opposite orientation in the two valleys. Electron–phonon calculations reproduce Tc only with careful treatment of anharmonicity and the charge density wave, which appears as soft phonon modes in harmonic DFT. NbS2 is the natural control: harmonic calculations predict a charge density wave there too, but anharmonic fluctuations of the lattice suppress it.
Exfoliate and encapsulate in a glovebox. When measuring upper critical fields, align the field precisely in-plane – misalignment of a fraction of a degree dominates the result. STM images the 3×3 charge density wave directly, and Raman soft modes track its transition.
Useful as a clean, atomically flat superconductor for research-grade quantum devices; air sensitivity and low transition temperature prevent broader use.
The newest items tagged NbSe2, NbS2, NbTe2, from the news feed updated 5 Oct 2026.
Transition metal ditellurides exhibit structural and electronic properties distinct from their selenide and sulfide counterparts, including the stabilization of multiple charge density wave (CDW) phases. Within the niobium compound family, notable differences in structure are also observed: bulk NbTe2 crystallizes in…
In this work, we revisit the classic Yu-Shiba-Rusinov (YSR) problem of magnetic impurities in s-wave superconductors and uncover a quantum geometric origin of the YSR bound-state structure. The key geometric quantity is the momentum-space average of Bloch band projector over low-energy electrons, whose matrix rank…
We report a systematic study of the composition-dependent bulk properties in Co1/3(1±δ)NbS2 single crystals across a series of precisely controlled cobalt compositions with −4%≤δ≤8%. By tuning the cobalt stoichiometry, we find that the topological Ha… [Phys. Rev. B 114, 134423] Published Fri Sep 18, 2026
Injection of pure spin current into superconductors remains a major challenge in superconducting spintronics. Previous studies have primarily focused on spin-polarized quasiparticles and spin-triplet supercurrents, while vortices, ubiquitous topological defects in type-2 superconductors, have been theoretically…
Advances in solid-state physics, materials science, and device engineering have accelerated the development of superconducting qubits. Among emerging platforms, van der Waals (vdW) materials and their heterostructures are potentially attractive building blocks for quantum devices, yet their realization in qubit…
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