Fluxoids and neutron polarisation effects

Forgan, E. M.; Kealey, P. G.; Riseman, T. M.; Paul, D. Mc K.; Aegerter, Christof M.; Cubitt, R.; Schleger, P.; Pautrat, Alain; Simon, Ch.; Johnson, S. T.

doi:10.1016/s0921-4526(99)00046-0

Cited by 9 publications

(3 citation statements)

References 20 publications

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“…A recent study on the same crystal used in our experiments has been performed using polarized neutrons, where the out-of-plane anisotropy may be estimated from the angular dependence of the components of internal field of the vortex lattice both longitudinal and transverse to the applied field direction. 31,32 Preliminary estimates from that experiment are in reasonable agreement with those presented here. 32 There is thus overall agreement between SR and SANS measurements of the in-plane and out-of-plane anisotropy, especially on the same single crystal.…”

Section: Discussionsupporting

confidence: 87%

Angular-dependent muon-spin rotation and torque magnetometry on the mixed state of the high-temperature superconductorYBa2Cu3
Ager
¹
,
Ogrin
²
,
Aegerter
³

et al. 2000
Phys. Rev. B
13
2
4
0
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Muon-spin rotation (SR͒ and torque magnetometry have been used to probe the anisotropy of an untwinned single crystal of YBa 2 Cu 3 O 7Ϫ␦. The absence of twin planes allows the ratios of all three principal components of the superconducting effective mass tensor to be determined. The values for the in-plane anisotropy are in good agreement with values obtained by other techniques. The out-of-plane anisotropies as measured by SR are also found to be in good agreement with other microscopic measurements, but somewhat lower than those resulting from torque measurements on this and other crystals.

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Section: Discussionsupporting

confidence: 87%

Angular-dependent muon-spin rotation and torque magnetometry on the mixed state of the high-temperature superconductorYBa2Cu3
Ager
¹
,
Ogrin
²
,
Aegerter
³

et al. 2000
Phys. Rev. B
13
2
4
0
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“…Details of the experimental setup and results are given in [6,10]. According to Josephson [11], when flux lines move, an electric field E is produced, which depends on their average velocity v L and the average induction B via v L = E/B.…”

Section: Neutron Spin Echo Measurementsmentioning

confidence: 99%

The microscopic investigation of structures of moving flux lines by neutron and muon techniques

2002

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We have used a variety of microscopic techniques to reveal the structure and motion of flux line arrangements, when the flux lines in low T c type II superconductors are caused to move by a transport current. Using small-angle neutron scattering by the flux line lattice (FLL), we are able to demonstrate directly the alignment by motion of the nearest-neighbor FLL direction. This tends to be parallel to the direction of flux line motion, as had been suspected from two-dimensional simulations. We also see the destruction of the ordered FLL by plastic flow and the bending of flux lines. Another technique that our collaboration has employed is the direct measurement of flux line motion, using the ultra-high-resolution spectroscopy of the neutron spin-echo technique to observe the energy change of neutrons diffracted by moving flux lines. The muon spin rotation (µSR) technique gives the distribution of values of magnetic field within the FLL. We have recently succeeded in performing µSR measurements while the FLL is moving. Such measurements give complementary information about the local speed and orientation of the FLL motion. We conclude by discussing the possible application of this technique to thin film superconductors.

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“…It appears that this is a sign of flux lines decomposing into 'pancake vortices', which are whirlpools of supercurrent located in individual superconducting planes. Such research has continued, with further information acquired about the pinning, melting and anisotropic behaviour of flux lines, and has even extended down to low-T c materials to use new neutron techniques for investigation of flux line motion under the influence of a current [30,31].…”

Section: Recent Observations Of Flux Lines In High-t C and Other Mate...mentioning

confidence: 99%

Vortices in superconductors

Forgan

1999

J. Phys.: Condens. Matter

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A personal view is given of important events in the research led by Joe Vinen on vortices in superconductors. The effect of electron-hole ('Andreev') scattering on transport processes, such as sound attenuation and thermal conductivity, in the mixed state is described. Theoretical work by Nozieres and Vinen on flux flow is shown still to be topical. The role of fluctuations in the transition to the normal state from the mixed state is described. These early experiments are reviewed in the light of evolving ideas about flux lattice melting which have been generated by high-T c research. Finally, recent observations of flux lines, using neutron and muon techniques, are linked to the work inspired by Joe Vinen. An appreciation is given of his distinctive approach to physics.

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Fluxoids and neutron polarisation effects

Cited by 9 publications

References 20 publications

Angular-dependent muon-spin rotation and torque magnetometry on the mixed state of the high-temperature superconductorYBa2Cu3
Ager
¹
,
Ogrin
²
,
Aegerter
³

et al. 2000
Phys. Rev. B
13
2
4
0
View full text Add to dashboard Cite

Angular-dependent muon-spin rotation and torque magnetometry on the mixed state of the high-temperature superconductorYBa2Cu3
Ager
¹
,
Ogrin
²
,
Aegerter
³

et al. 2000
Phys. Rev. B
13
2
4
0
View full text Add to dashboard Cite

The microscopic investigation of structures of moving flux lines by neutron and muon techniques

Vortices in superconductors

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Fluxoids and neutron polarisation effects

Cited by 9 publications

References 20 publications

Angular-dependent muon-spin rotation and torque magnetometry on the mixed state of the high-temperature superconductorYBa2Cu3Ager1, Ogrin2, Aegerter3 et al. 2000Phys. Rev. B13240View full textAdd to dashboardCite

Angular-dependent muon-spin rotation and torque magnetometry on the mixed state of the high-temperature superconductorYBa2Cu3Ager1, Ogrin2, Aegerter3 et al. 2000Phys. Rev. B13240View full textAdd to dashboardCite

The microscopic investigation of structures of moving flux lines by neutron and muon techniques

Vortices in superconductors

Contact Info

Product

Resources

About

Angular-dependent muon-spin rotation and torque magnetometry on the mixed state of the high-temperature superconductorYBa2Cu3
Ager
¹
,
Ogrin
²
,
Aegerter
³

et al. 2000
Phys. Rev. B
13
2
4
0
View full text Add to dashboard Cite

Angular-dependent muon-spin rotation and torque magnetometry on the mixed state of the high-temperature superconductorYBa2Cu3
Ager
¹
,
Ogrin
²
,
Aegerter
³

et al. 2000
Phys. Rev. B
13
2
4
0
View full text Add to dashboard Cite