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

Research output: Contribution to journalArticlepeer-review

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 spinpolarized 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.

Original languageEnglish (US)
Pages (from-to)14692-14696
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume59
Issue number22
StatePublished - 1999

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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