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Deviations from the extended London model at high magnetic fields in YBa2Cu3 O7

Campillo, E. LU ; Bartkowiak, M. ; Riyat, R. ; Jellyman, E. ; Cameron, A. S. ; Holmes, A. T. ; Prokhnenko, O. ; Stein, W. D. ; Erb, A. and Forgan, E. M. , et al. (2022) In Physical Review B 105(18).
Abstract

We report on the evolution with the magnetic field and the temperature of the vortex lattice (VL) in fully oxygenated YBa2Cu3O7 as studied by time-of-flight small-angle neutron scattering. Using the High Field Magnet/Extreme Environment Diractometer beamline at Helmholtz-Zentrum Berlin, we have obtained data up to 25.9 T - much higher than data available previously. Our VL structure results are consistent with the progressive suppression by the field of the superconductivity along the crystallographic b (CuO chain) direction and an accompanying shift of the nodal directions as the field is increased. The intensity of the diffracted signal reveals the spatial variation of magnetization caused by the VL (the "form factor"). Instead of a... (More)

We report on the evolution with the magnetic field and the temperature of the vortex lattice (VL) in fully oxygenated YBa2Cu3O7 as studied by time-of-flight small-angle neutron scattering. Using the High Field Magnet/Extreme Environment Diractometer beamline at Helmholtz-Zentrum Berlin, we have obtained data up to 25.9 T - much higher than data available previously. Our VL structure results are consistent with the progressive suppression by the field of the superconductivity along the crystallographic b (CuO chain) direction and an accompanying shift of the nodal directions as the field is increased. The intensity of the diffracted signal reveals the spatial variation of magnetization caused by the VL (the "form factor"). Instead of a rapid falloff with the field, as seen in superconductors with smaller upper critical fields, we find that the form factor is almost constant with the field above ∼12 T. We speculate that this is due to Pauli paramagnetic effects.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
105
issue
18
article number
184508
publisher
American Physical Society
external identifiers
  • scopus:85130079240
  • scopus:85130079240
ISSN
2469-9950
DOI
10.1103/PhysRevB.105.184508
language
English
LU publication?
yes
id
c84a6cd5-5bbe-4778-a64d-edea1948fce2
date added to LUP
2022-05-31 14:50:42
date last changed
2023-11-21 09:34:03
@article{c84a6cd5-5bbe-4778-a64d-edea1948fce2,
  abstract     = {{<p>We report on the evolution with the magnetic field and the temperature of the vortex lattice (VL) in fully oxygenated YBa2Cu3O7 as studied by time-of-flight small-angle neutron scattering. Using the High Field Magnet/Extreme Environment Diractometer beamline at Helmholtz-Zentrum Berlin, we have obtained data up to 25.9 T - much higher than data available previously. Our VL structure results are consistent with the progressive suppression by the field of the superconductivity along the crystallographic b (CuO chain) direction and an accompanying shift of the nodal directions as the field is increased. The intensity of the diffracted signal reveals the spatial variation of magnetization caused by the VL (the "form factor"). Instead of a rapid falloff with the field, as seen in superconductors with smaller upper critical fields, we find that the form factor is almost constant with the field above ∼12 T. We speculate that this is due to Pauli paramagnetic effects.</p>}},
  author       = {{Campillo, E. and Bartkowiak, M. and Riyat, R. and Jellyman, E. and Cameron, A. S. and Holmes, A. T. and Prokhnenko, O. and Stein, W. D. and Erb, A. and Forgan, E. M. and Blackburn, E.}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  month        = {{05}},
  number       = {{18}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Deviations from the extended London model at high magnetic fields in YBa2Cu3 O7}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.105.184508}},
  doi          = {{10.1103/PhysRevB.105.184508}},
  volume       = {{105}},
  year         = {{2022}},
}