期刊
NPJ QUANTUM MATERIALS
卷 7, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41535-021-00412-8
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资金
- European Research Council Advanced Grant FACT [ERC-2017-AdG-788890]
- CarESS project, Deutsche Forschungsgemeinschaft through grant CRC 183 [C03]
- European Research Council through the consolidator grant NanoSpin
We performed an STM and ab-initio study on the anisotropic superconductivity of 2H-NbSe2 in the CDW phase. Our results show a clear double-peak structure in the differential-conductance spectra, and the density functional theory simulations accurately reproduce the observed superconducting gap. We identified the high-gap region responsible for the main STM peak as the CC layer, which belongs to the same Fermi surface sheet broken by the CDW gap opening. Our findings suggest a spatially localized competition between superconductivity and CDW in the HC regions of the crystal.
We present a scanning tunneling microscopy (STM) and ab-initio study of the anisotropic superconductivity of 2H-NbSe2 in the charge-density-wave (CDW) phase. Differential-conductance spectra show a clear double-peak structure, which is well reproduced by density functional theory simulations enabling full k- and real-space resolution of the superconducting gap. The hollow-centered (HC) and chalcogen-centered (CC) CDW patterns observed in the experiment are mapped onto separate van der Waals layers with different electronic properties. We identify the CC layer as the high-gap region responsible for the main STM peak. Remarkably, this region belongs to the same Fermi surface sheet that is broken by the CDW gap opening. Simulations reveal a highly anisotropic distribution of the superconducting gap within single Fermi sheets, setting aside the proposed scenario of a two-gap superconductivity. Our results point to a spatially localized competition between superconductivity and CDW involving the HC regions of the crystal.
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