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dc.contributor.authorHan, Sang-Wook, 1964-eng
dc.contributor.authorMiceli, Paul F.eng
dc.contributor.authorFarmer, J.eng
dc.contributor.authorFelcher, G.eng
dc.contributor.authorGoyette, R.eng
dc.contributor.authorKiehne, G. T.eng
dc.contributor.authorKetterson, J. B.eng
dc.date.issued2001eng
dc.descriptionhttp://arxiv.org/PS_cache/cond-mat/pdf/0108/0108364v1.pdfeng
dc.description.abstractWe present the studies of non-uniformly distributed vortices in Nb/Al multilayers at applied field near parallel to film surface by using spin-polarized neutron reflectivity (SPNR) and DC magnetization measurements. We have observed peaks above the lower critical field, Hc1, in the M-H curves from the multilayers. Previous works with a model calculation of minimizing Gibbs free energy have suggested that the peaks could be ascribed to vortex line transitions for spatial commensuration in a thin film superconductor. In order to directly determine the distribution of vortices, we performed SPNR measurements on the multilayer and found that the distribution and density of vortices are different at ascending and descending fields. At ascending 2000 Oe which is just below the first peak in the M-H curve, SPNR shows that vortices are mostly localized near a middle line of the film meanwhile the vortices are distributed in broader region at the descending 2000 Oe. That is related to the observation of more vortices trapped at the descending field. As the applied field is sightly tilted (< 3.5degree), we observe another peak at a smaller field. The peak position is consistent with the parallel lower critical field (H[subscrip c1||]). We discuss that the vortices run along the applied field below H[subscript c1||] and rotate parallel to the surface at H[subscript c1||].eng
dc.description.sponsorshipSupport is gratefully acknowledged (PFM, SWH) from the Midwest Superconductivity Consortium (MISCON) under DOE grant DE-FG02-90ER45427, the NSF DMR 96-23827, and the use of the Intense Pulsed Neutron Source at Argonne National Laboratory. This facility is funded by the U. S. Department of Energy, BES-Materials Sciences, under Contract W-31-109-Eng-38.eng
dc.identifier.citationarXiv:cond-mat/0108364v1eng
dc.identifier.urihttp://hdl.handle.net/10355/7471eng
dc.languageEnglisheng
dc.publisherarXiveng
dc.relation.ispartofcollectionUniversity of Missouri--Columbia. College of Arts and Sciences. Department of Physics and Astronomy. Physics and Astronomy publicationseng
dc.subjectstrongly correlated electronseng
dc.subject.lcshSuperconductivityeng
dc.subject.lcshElectron configurationeng
dc.titleDistribution of parallel vortices studied by spin-polarized neutron reflectivity and magnetizationeng
dc.typeArticleeng


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