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

Date
2015-10-01
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Zhang, Jessie
Kim, Jeehoon
Huefner, Magdalena
Canfield, Paul
Ye, Cun
Kim, Stella
Canfield, Paul
Prozorov, Ruslan
Auslaender, Ophir
Hoffman, Jennifer
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Ames Laboratory
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Physics and Astronomy
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Ames LaboratoryPhysics and Astronomy
Abstract

We use a magnetic force microscope (MFM) to investigate single-vortex pinning and penetration depth in NdFeAsO1−xFx, one of the highest-Tc 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, Fdepin≃4.5 pN, corresponding to a critical current up to Jc≃7×105 A/cm2. Furthermore, our MFM measurements allow the first local and absolute determination of the superconducting in-plane penetration depth in NdFeAsO1−xFx,λab=320±60 nm, which is larger than previous bulk measurements.

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This article is published as 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 1− x F x." Physical Review B 92, no. 13 (2015): 134509. DOI: 10.1103/PhysRevB.92.134509. Posted with permission.

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