Two-dimensional superconductivity in a bulk superlattice van der Waals material Ba6Nb11Se28
Ke Ma, Shifeng Jin, Fanqi Meng, Qinghua Zhang, Ruijin Sun, Jun Deng, Long Chen, Lin Gu, Gang Li, Zhihua Zhang
DOI 10.1103/PhysRevMaterials.6.044806 · Physical Review Materials
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Abstract
The observation of clean 2D superconductivity and bosonic Landau levels below 0.85 K in superlattice van der Waals material Ba6Nb11S28 have received much interest. Here we report the crystal structure, Hall resistivity, and 2D superconductivity of its sister compound, Ba6Nb11Se28. The atomic-resolution transmission electron microscopy images reveal an alternate stacking of 2H−NbSe2 with a 3 × 3 commensurate block layer, which is isostructural to Ba6Nb11S28 and with a larger NbX2 (X=S, Se) interlayer distance (12.8 Å). Transport property measurements demonstrate a twofold enhancement in superconducting temperature (Tc0=2.2K), meanwhile the anisotropy in resistivity and carrier mobility in Ba6Nb11Se28 decrease drastically compared to its sulfur counterpart, driving the superconductor towards the dirty limit. Further measurements of angular-dependent upper critical field suggest the superconductivity in Ba6Nb11Se28 be Pauli-limit breaking (2 times the μ0HP), and can be well described by the 2D Tinkham form. Our findings offer a valuable platform to investigate 2D superconductivity in bulk superlattice materials based on the transition-metal dichalcogenides.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba6Nb11Se28 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | Pressure not reported | onset |
| Ba6Nb11Se28 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.2 | Pressure not reported | zero_resistance |
| Ba6Nb11S28 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.85 | Pressure not reported | unknown |
| NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | Pressure not reported | zero_resistance |
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