Small-angle scattering from the vortex lattice in high-Tc and other superconductors

Kealey, P. G.; Forgan, E. M.; Lloyd, S. J.; Riseman, T. M.; Paul, D. McK.; Johnson, S. T.; Simon, Ch.; Pautrat, Alain; Cubitt, R.; Schleger, P.; Dewhurst, C. D.; Aegerter, Christof M.; Ager, C.

doi:10.1016/s0921-4526(99)01680-4

Cited by 7 publications

(1 citation statement)

References 17 publications

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“…Initial measurements have been reported for a metallurgically polycrystalline Pb-In sample [7,8], in which the FLL initially formed on cooling in a constant field is also polycrystalline. On passing a transport current exceeding the critical current, the moving FLL tends to become aligned as predicted.…”

Section: San's Resultsmentioning

confidence: 99%

Microscopic investigation of moving flux line structures in superconductors using neutron diffraction and μSR

et al. 2002

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We have used a variety of microscopic techniques to reveal the structure and motion of flux line arrangements, while the flux lines are caused to move by a transport current. Using small-angle neutron scattering, we are able to demonstrate direaly the alignment of the nearest-neighbour direction of flux lines while they are moving. The results are similar but not identical to those from two-dimensional simulations. We also see the destruction of the flux lattice by plastic flow and the bending of flux lines. We have also employed μSR, which measures the distribution of field values within the mixed state, to obtain information about the speed and degree of order of the motion of flux lines past the muons. Such measurements give complementary information to that obtained by neutron techniques. The general aspects of these measurements, of interest to those working in other areas, are the creation of order in non-equilibrium situations and the interplay of the ordering cccuning during dissipation and the ordering caused by the crystal structure of the superconductor which is host to the flux lines.

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Section: San's Resultsmentioning

confidence: 99%

Microscopic investigation of moving flux line structures in superconductors using neutron diffraction and μSR

et al. 2002

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Neutron Scattering from Vortex Lattices in Superconductors

Huxley¹

2002

Springer Series in Solid-State Sciences

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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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Small-angle scattering from the vortex lattice in high-Tc and other superconductors

Cited by 7 publications

References 17 publications

Microscopic investigation of moving flux line structures in superconductors using neutron diffraction and μSR

Microscopic investigation of moving flux line structures in superconductors using neutron diffraction and μSR

Neutron Scattering from Vortex Lattices in Superconductors

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

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