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Unconventional superconductivity in the nickel chalcogenide superconductor TlNi2Se2

Jellyman, E. ; Jefferies, P. ; Pollard, S. ; Forgan, E. M. ; Blackburn, E. LU ; Campillo, E. LU ; Holmes, A. T. ; Cubitt, R. ; Gavilano, J. and Wang, Hangdong , et al. (2020) In Physical Review B 101(13).
Abstract
We present the results of a study of the vortex lattice (VL) of the nickel chalcogenide superconductor TlNi2Se2, using small angle neutron scattering. This superconductor has the same crystal symmetry as the iron arsenide materials. Previous work points to it being a two-gap superconductor, with an unknown pairing mechanism. No structural transitions in the vortex lattice are seen in the phase diagram, arguing against d-wave gap symmetry. Empirical fits of the temperature dependence of the form factor and penetration depth rule out a simple s-wave model, supporting the presence of nodes in the gap function. The variation of the VL opening angle with field is consistent with earlier reports of multiple gaps
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
101
issue
13
article number
134523
publisher
American Physical Society
external identifiers
  • scopus:85084931630
ISSN
2469-9950
DOI
10.1103/PhysRevB.101.134523
language
English
LU publication?
yes
id
5becce95-a26b-45fd-a361-c675c9f94494
date added to LUP
2020-05-05 10:19:26
date last changed
2022-04-18 22:12:04
@article{5becce95-a26b-45fd-a361-c675c9f94494,
  abstract     = {{We present the results of a study of the vortex lattice (VL) of the nickel chalcogenide superconductor TlNi2Se2, using small angle neutron scattering. This superconductor has the same crystal symmetry as the iron arsenide materials. Previous work points to it being a two-gap superconductor, with an unknown pairing mechanism. No structural transitions in the vortex lattice are seen in the phase diagram, arguing against d-wave gap symmetry. Empirical fits of the temperature dependence of the form factor and penetration depth rule out a simple s-wave model, supporting the presence of nodes in the gap function. The variation of the VL opening angle with field is consistent with earlier reports of multiple gaps}},
  author       = {{Jellyman, E. and Jefferies, P. and Pollard, S. and Forgan, E. M. and Blackburn, E. and Campillo, E. and Holmes, A. T. and Cubitt, R. and Gavilano, J. and Wang, Hangdong and Du, Jianhua and Fang, Minghu}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  month        = {{04}},
  number       = {{13}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Unconventional superconductivity in the nickel chalcogenide superconductor TlNi2Se2}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.101.134523}},
  doi          = {{10.1103/PhysRevB.101.134523}},
  volume       = {{101}},
  year         = {{2020}},
}