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Single-vortex pinning and penetration depth in superconducting NdFeAsO1-xFx

TitleSingle-vortex pinning and penetration depth in superconducting NdFeAsO1-xFx
Publication TypeJournal Article
Year of Publication2015
AuthorsZhang, JT, Kim, J, Huefner, M, Ye, C, Kim, S, Canfield, PC, Prozorov, R, Auslaender, OM, Hoffman, JE
JournalPhysical Review B
Volume92
Pagination134509
Date Published10
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000362890900007
Keywordsba0.6k0.4fe2as2, electronic phase-diagram, force, ii superconductors, Spectroscopy, states, vortices
Abstract

We use a magnetic force microscope (MFM) to investigate single-vortex pinning and penetration depth in NdFeAsO1-xFx, one of the highest-T-c iron-based superconductors. In fields up to 20 G, we observe a disordered vortex arrangement, implying that the pinning forces are stronger than the vortex-vortex interactions. We measure the typical force to depin a single vortex, F-depin similar or equal to 4.5 pN, corresponding to a critical current up to J(c) similar or equal to 7 x 10(5) A/cm(2). Furthermore, our MFM measurements allow the first local and absolute determination of the superconducting in-plane penetration depth in NdFeAsO1-x F-x, lambda(ab) = 320 +/- 60 nm, which is larger than previous bulk measurements.

DOI10.1103/PhysRevB.92.134509
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