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- W2948161010 abstract "The recent development of two-dimensional (2D) van der Waals (vdW) materials has enabled the rapid exploration of novel low-dimensional electronic phenomena. The family of hexagonal transition metal dichalcogenides ($H$-$MX_2$) has proven to be a particularly rich host of exotic quantum phases due to their crystal structure and strong spin-orbit coupling. However, these materials are often subject to degradation, and for exfoliated materials, reduction in quality during the fabrication process can constrain the phase space for potential ground states. Here we show that high-quality $H$-NbS$_2$ monolayers with electronic mobilities more than three orders of magnitude larger than in bulk $2H$-NbS$_{2}$ can be realized in a bulk single crystal superlattice formed with a commensurate block layer. We find that these materials are clean-limt 2D superconductors exhibiting a Berezinskii-Kosterlitz-Thouless (BKT) transition at $T_{BKT} = 0.82$ K and prominent 2D Shubnikov de-Haas quantum oscillations. Furthermore, we observe an enhancement of the superconducting upper critical field $mu_0H_{c2}$ beyond the Pauli limit for field applied within a narrow angular window $delta theta lesssim 2^circ$ of the layer plane, which we show is consistent with field-induced finite momentum Cooper pairing enhanced by local symmetry breaking. Our results demonstrate the ability of these commensurate superlattices to support clean monolayer $H$-$MX_2$ beyond that possible in their bulk $2H$-$MX_2$ counterparts and monolayers exfoliated therefrom. Their structure and exfoliability offer pathways to direct probing of pair density wave superconductivity and, more broadly, the possibility of engineering other high quality 2D $MX_2$ layers in a new class of bulk single crystal superlattices." @default.
- W2948161010 created "2019-06-14" @default.
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- W2948161010 date "2019-06-05" @default.
- W2948161010 modified "2023-09-27" @default.
- W2948161010 title "Evidence for clean 2D superconductivity and field-induced finite-momentum pairing in a bulk vdW superlattice" @default.
- W2948161010 hasPublicationYear "2019" @default.
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