The nature of superconductivity in $2H\text{−}{\mathrm{NbSe}}_2$ has generated sustained debate in the recent past. While angle resolved photoemission spectroscopy data have been interpreted as evidence for multiband superconductivity, the data from scanning tunneling microscope experiments relate to strongly anisotropic single-band superconductivity. In the later case, the charge density wave (CDW) order mimics the multigap character. Because the CDW reconstructs the Fermi surface and modifies the superconducting gap distribution, disentangling intrinsic multiband pairing from CDW-related effects is challenging. To address this issue, we investigate single-crystalline $2H$-NbSeS, a mixed-chalcogen analog of $2H\text{−}{\mathrm{NbSe}}_2$ in which random Se/S substitution suppresses long-range CDW order while preserving the layered crystal structure $P{6}_3/mmc$. The material becomes superconducting below $T_c\approx 6.0\mathrm{K}$ with moderate magnetic anisotropy $\gamma \approx 3.2$. The upper critical field $H_{c2}\left(T\right)$ exhibits a pronounced upward curvature that cannot be described within a single-band framework but is well captured by a dirty-limit two-band model with a large diffusivity ratio. This indicates strong band-dependent scattering. The in-plane upper critical field $H_{c2}^{\parallel ab}\left(0\right)\approx 14.7\mathrm{T}$ exceeds the weak-coupling Pauli limit. Measurements of the lower critical field, the superfluid density, and the electronic specific heat are consistent with an interpretation in terms of a fully gapped superconducting state with two nodeless gaps of different magnitudes.

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• Multiband superconductivity
• Penetration depth
• Specific heat
• Superconducting order parameter