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Journal Article

Orbital-selective two-dimensional superconductivity in 2H−NbS2


Tang,  P.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science;
Institute for Materials Research, Tohoku University;

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Bi, X., Li, Z., Huang, J., Qin, F., Zhang, C., Xu, Z., et al. (2022). Orbital-selective two-dimensional superconductivity in 2H−NbS2. Physical Review Research, 4(1): 013188. doi:10.1103/PhysRevResearch.4.013188.

Cite as: https://hdl.handle.net/21.11116/0000-000A-2080-0
Orbital-selective superconductivity is crucial for understanding the pairing mechanism for multiband superconductors. Atomic d orbitals with anisotropic spatial extension can directly determine the energy dispersion of subbands with two-dimensional (2D) or three-dimensional (3D) nature in band structure. Theoretically, owing to the coexistence of these 2D and 3D subbands, the orbital-selective superconductivity can exhibit band-dependent dimensionality in multiband superconductors. However, to experimentally confirm this orbital-selective 2D superconductivity remains challenging and elusive. Herein, based on angle-dependent upper critical magnetic field on 2H−NbS2 flakes, we observe a cusp peak associated with a 2D superconducting subband from the dxy and dx2−y2 orbitals of Nb atoms, and a round peak related to a 3D subband, directly confirming the existence of intrinsic 2D superconductivity in 2H−NbS2 thick flake and its orbital-selective superconducting nature. The 2D superconductivity remains robust under large electric current or high pressure. Such observations shed light on the orbital-selective pairing mechanism and resulting band-dependent dimensionality for multiband superconductors.