Measurement of Vortex Motion in a Type-II Superconductor: A Novel Use of the Neutron Spin-Echo Technique
E. M. Forgan, P. G. Kealey, S. T. Johnson, A. Pautrat, Ch. Simon, S. L. Lee, C. M. Aegerter, R. Cubitt, B. Farago, P. Schleger
DOI 10.1103/PhysRevLett.85.3488 · Physical Review Letters
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Abstract
We have used the neutron spin-echo technique to measure the small energy change of neutrons which are diffracted by a moving vortex lattice in a low-pinning Nb-Ta superconducting sample. A transport current was passed in the mixed state to cause flux line movement. In the case of uniform motion, the flux velocity vL was given as expected by the values of electric and magnetic fields, via E=−vL∧B. We show that with a nonuniformly moving vortex lattice, one can measure the dispersion of the velocities, opening up new possibilities for investigating moving vortex lines.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb87Ta13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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