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

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [2];  [2];  [3];  [4];  [4];  [4];  [5];  [2]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Harvard Univ., Cambridge, MA (United States)
  3. Tsinghua Univ., Beijing (China)
  4. Iowa State Univ., Ames, IA (United States)
  5. Israel Institute of Technology, Haifa (Israel)
+ Show Author Affiliations
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.
Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1227430
Alternate ID(s):
OSTI ID: 1224649
Report Number(s):
IS-J--8838
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 13 Vol. 92; ISSN 1098-0121; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

Dependence of the absolute value of the penetration depth in ( Ba 1 − x K x ) Fe 2 As 2 on doping journal August 2018

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