Using spin-polarized neutron reflectivity to probe mesoscopic vortex states in a Pb thin-film superconductor

Alan John Drew, Matthew Peter Wismayer, David Owen Goudie Heron, Stephen Joseph Shelford Lister, Stephen Leslie Lee, A. Potenza, C.H. Marrows, R.M. Dalgleish, T.R. Charlton, S. Langridge

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Spin-polarized neutron-reflectivity measurements have been performed on superconducting Pb films. For fields applied in the plane of the film we are able to determine the magnetic field profile across the thickness of the film in the superconducting state. This allows the direct observation of distinct mesoscopic ground states in this geometry, from Meissner expulsion to a double row of vortices, which occur as a function of film thickness and external magnetic field. The data can be compared directly with solutions of the time-dependent Ginzburg-Landau equations, where we demonstrate good agreement between data and simulation. This provides a powerful demonstration of this widely applicable experimental technique to study mesoscopic ground states and a useful validation of this theoretical approach.
© 2009 The American Physical Society
Original languageEnglish
Article number134510
Number of pages6
JournalPhysical Review. B, Condensed matter and materials physics
Volume80
Issue number13
DOIs
Publication statusPublished - Oct 2009

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