Single-vortex pinning and penetration depth in superconducting NdFeAsO1-xFx [electronic resource].
- Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2015. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
- Physical Description:
- Article numbers 134,509 : digital, PDF file
- Additional Creators:
- Ames Laboratory, United States. Department of Energy. Office of Basic Energy Sciences, and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- 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 Gauss, 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. As a result, 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.
- Published through SciTech Connect., 10/12/2015., "is-j--8838", Physical Review. B, Condensed Matter and Materials Physics 92 13 ISSN 1098-0121; PRBMDO AM, and Zhang, Jessie; Kim, Jeehoon; Huefner, Magdalena; Ye, Cun; Kim, Stella; Canfield, Paul; Prozorov, Ruslan; Auslaender, Ophir; Hoffman, Jennifer.
- Funding Information:
- AC02-07CH11358, PHY01-17795, 2010305, and HU 1960/11
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