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99214 |
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|a Zhang, Jessie T.
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|a Massachusetts Institute of Technology. Department of Physics
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|a Zhang, Jessie T.
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|a Kim, Jeehoon
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|a Huefner, Magdalena
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|a Ye, Cun
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|a Kim, Stella
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|a Canfield, Paul C.
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|a Prozorov, Ruslan
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|a Auslaender, Ophir M.
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|a Hoffman, Jennifer E.
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|a Single-vortex pinning and penetration depth in superconducting NdFeAsO[subscript 1−x]F[subscript x]
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|b American Physical Society,
|c 2015-10-13T11:52:31Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/99214
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|a We use a magnetic force microscope (MFM) to investigate single-vortex pinning and penetration depth in NdFeAsO[subscript 1−x]F[subscript x], one of the highest-T[subscript 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[subscript depin] ≃ 4.5 pN, corresponding to a critical current up to J[subscript c] ≃ 7 × 10[superscript 5] A/cm[superscript 2]. Furthermore, our MFM measurements allow the first local and absolute determination of the superconducting in-plane penetration depth in NdFeAsO[subscript 1−x]F[subscript x],λ[subscript ab] = 320 ± 60 nm, which is larger than previous bulk measurements.
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|a Massachusetts Institute of Technology. Undergraduate Research Opportunities Program
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|a Article
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|t Physical Review B
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