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| Home > Publications database > Two characteristic contributions to the superconducting state of 2H-NbSe2 |
| Conference Presentation (Invited) | FZJ-2025-03223 |
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2025
Abstract: Multiband superconductivity emerges when multiple electronic bands contribute to the formation of the superconducting state, allowing for distinct pairing mechanisms and complex gap structures, leading to rich physics that extends beyond single-band superconductivity. The layered superconductor 2H-NbSe₂, known for its multiband characteristics, provides a compelling platform to explore these phenomena. This study aims to resolve the nature of superconductivity in 2H-NbSe₂ by employing small-angle neutron scattering (SANS) to investigate the field- and temperature-dependent vortex lattice structure in 2H-NbSe₂.Using SANS, we measured the form factor of the magnetic field in the vortex lattice, gaining microscopic insight into the bulk superconducting state. Field- and temperature-dependent data reveal a significant degree of interband coupling, with clear evidence of two distinct superconducting bands. At low temperatures and fields, the two gaps are 13.1 and 6.5 K (∆0 = 1.88 and 0.94 kBTc); with the larger gap band contributing approximately two-thirds of the superfluid density. Notably, the vortex lattice signal from one band is suppressed at fields well below Bc2 , underscoring the distinct roles of the two bands. The zero-field and zero-temperature penetration depth is extrapolated to be 160 nm [1].These findings not only provide critical insights into the multiband nature of 2H-NbSe₂ but also highlight the intricate role of interband coupling in shaping its vortex lattice properties and superconducting behavior. This study contributes to the broader debate on multiband superconductivity, offering quantitative evidence to refine theoretical models.[1] A. Alshemi et al., arXiv 2411.17357 (2024).
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