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@INPROCEEDINGS{Forgan:1044486,
      author       = {Forgan, E. and Heiss, A. and Cubitt, R. and White, J. and
                      Schmalzl, K. and Alshemi, A. and Blackburn, E.},
      title        = {{T}wo characteristic contributions to the superconducting
                      state of 2{H}-{N}b{S}e2},
      reportid     = {FZJ-2025-03223},
      year         = {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).},
      month         = {Jul},
      date          = {2025-07-06},
      organization  = {The International Conference on
                       Neutron Scattering, Bella Center in
                       Copenhagen, Denmark, with the last day
                       at the European Spallation Source (ESS)
                       in nearby Lund, Sweden (Denmark), 6 Jul
                       2025 - 10 Jul 2025},
      subtyp        = {Invited},
      cin          = {JCNS-2 / JARA-FIT / JCNS-ILL},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)JCNS-ILL-20110128},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (FZJ) (POF4-6G4)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G4},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/1044486},
}