Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Two Characteristic Contributions to the Superconducting State of 2H−NbSe2

Alshemi, A. LU orcid ; Forgan, E. M. ; Hiess, A. LU ; Cubitt, R. ; White, J. S. ; Schmalzl, K. and Blackburn, E. LU (2025) In Physical Review Letters 134(11).
Abstract
Multiband superconductivity arises when multiple electronic bands contribute to the formation of the superconducting state, allowing distinct pairing interactions and gap structures. Here, we present field- and temperature-dependent data on the vortex lattice structure in 2H-NbSe2 as a contribution to the ongoing debate as to whether the defining feature of the superconductivity is the anisotropy or the multiband nature. The field-dependent data clearly show that there are two distinct superconducting bands, and the contribution of one of them to the vortex lattice signal is completely suppressed for magnetic fields above ∼0.8 T, well below Bc2. By combining the temperature and field scans, we can deduce... (More)
Multiband superconductivity arises when multiple electronic bands contribute to the formation of the superconducting state, allowing distinct pairing interactions and gap structures. Here, we present field- and temperature-dependent data on the vortex lattice structure in 2H-NbSe2 as a contribution to the ongoing debate as to whether the defining feature of the superconductivity is the anisotropy or the multiband nature. The field-dependent data clearly show that there are two distinct superconducting bands, and the contribution of one of them to the vortex lattice signal is completely suppressed for magnetic fields above ∼0.8 T, well below Bc2. By combining the temperature and field scans, we can deduce that there is a moderate degree of interband coupling. From the observed temperature dependences, we find that at low field and zero temperature, the two gaps in temperature units are 13.1 ± 0.2 and 6.5 ± 0.3 K (Δ0 ¼ 1.88 and 0.94 kBTc); the band with the larger gap gives just under two-thirds of the superfluid density. The penetration depth extrapolated to zero field and zero temperature is 160 ± 2 nm. (Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
134
issue
11
article number
116001
pages
8 pages
publisher
American Physical Society
external identifiers
  • scopus:105000671704
  • pmid:40192366
ISSN
1079-7114
DOI
10.1103/PhysRevLett.134.116001
project
Wide-angle neutron polarisation analysis to study energy and quantum materials
language
English
LU publication?
yes
id
72f0403f-9c07-4264-93e4-d1f5dd2b883e
date added to LUP
2025-03-18 16:37:38
date last changed
2025-11-12 11:08:13
@article{72f0403f-9c07-4264-93e4-d1f5dd2b883e,
  abstract     = {{Multiband superconductivity arises when multiple electronic bands contribute to the formation of the superconducting state, allowing distinct pairing interactions and gap structures. Here, we present field- and temperature-dependent data on the vortex lattice structure in 2<i>H</i>-NbSe<sub>2</sub> as a contribution to the ongoing debate as to whether the defining feature of the superconductivity is the anisotropy or the multiband nature. The field-dependent data clearly show that there are two distinct superconducting bands, and the contribution of one of them to the vortex lattice signal is completely suppressed for magnetic fields above ∼0.8 T, well below <i>B</i><sub>c2</sub>. By combining the temperature and field scans, we can deduce that there is a moderate degree of interband coupling. From the observed temperature dependences, we find that at low field and zero temperature, the two gaps in temperature units are 13.1 ± 0.2 and 6.5 ± 0.3 K (Δ<sub>0</sub> ¼ 1.88 and 0.94 <i>k</i><sub>B</sub><i>T</i><sub>c</sub>); the band with the larger gap gives just under two-thirds of the superfluid density. The penetration depth extrapolated to zero field and zero temperature is 160 ± 2 nm.}},
  author       = {{Alshemi, A. and Forgan, E. M. and Hiess, A. and Cubitt, R. and White, J. S. and Schmalzl, K. and Blackburn, E.}},
  issn         = {{1079-7114}},
  language     = {{eng}},
  month        = {{03}},
  number       = {{11}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Letters}},
  title        = {{Two Characteristic Contributions to the Superconducting State of 2H−NbSe2}},
  url          = {{http://dx.doi.org/10.1103/PhysRevLett.134.116001}},
  doi          = {{10.1103/PhysRevLett.134.116001}},
  volume       = {{134}},
  year         = {{2025}},
}