Single-vortex pinning and penetration depth in superconducting NdFeAsO[subscript 1−x]F[subscript x]
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PhysRevB.92.134509.pdf
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1.66 MB
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Author(s)
Zhang, Jessie T.
Kim, Jeehoon
Huefner, Magdalena
Ye, Cun
Kim, Stella
Canfield, Paul C.
Prozorov, Ruslan
Auslaender, Ophir M.
Hoffman, Jennifer E.
Date Issued
October 2015
Journal
Physical Review B
Publisher
American Physical Society
Citation
Zhang, Jessie T., Jeehoon Kim, Magdalena Huefner, Cun Ye, Stella Kim, Paul C. Canfield, Ruslan Prozorov, Ophir M. Auslaender, and Jennifer E. Hoffman. "Single-vortex pinning and penetration depth in superconducting NdFeAsO[subscript 1−x]F[subscript x]." Phys. Rev. B 92, 134509 (October 2015). © 2015 American Physical Society
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.92.134509
