Spin-polarized neutron reflectivity: A probe of vortices in thin-film superconductors
S.-W. Han, J. F. Ankner, H. Kaiser, P. F. Miceli, E. Paraoanu, L. H. Greene
DOI 10.1103/PhysRevB.59.14692 · Physical Review B
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Abstract
It is demonstrated that the specular reflectivity of spin-polarized neutrons can be used to study vortices in a thin-film superconductor. Experiments were performed on a 6000 Å thick c-axis film of YBa2Cu3O7−x with the magnetic field applied parallel to the surface. A magnetic hysteresis loop was observed for the spin-polarized reflection and, from these data, the average density of vortices was extracted. A model is presented which relates the specular reflectivity to the one-dimensional spatial distribution of vortices in the direction perpendicular to the surface. Unlike other techniques, neutron reflectivity observes vortices in a geometry where they are parallel to the interface.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89.8 | Pressure not reported | onset |
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