J D Moore et al 2009 Supercond. Sci. Technol. 22 125023 doi:10.1088/0953-2048/22/12/125023
The effect of columnar defects on the pinning properties of NdFeAsO0.85 conglomerate particles
J D Moore1, L F Cohen1, Y Yeshurun1,5, A D Caplin1, K Morrison1, K A Yates1, C M McGilvery2, J M Perkins2, D W McComb2, C Trautmann3, Z A Ren4, J Yang4, W Lu4, X L Dong4 and Z X Zhao4
Show affiliationsAn oxypnictide superconductor NdFeAsO0.85 sample with transition temperature of 46 K was irradiated with 2 GeV Ta ions at a fluence of 5 × 1010 ions cm−2. High resolution transmission electron microscopy study revealed that the irradiation produced columnar-like defects. The effect of these defects on the irreversible magnetization in polycrystalline randomly oriented fragments was studied as a function of field angle and field sweep rate. We find that the critical current density is moderately enhanced at fields below the matching field (~1 T). The pinning enhancement is anisotropic and maximum along the defect direction at 35 K, but becomes more isotropic as the temperature is decreased. The creep rate is suppressed at 35 K and at fields below the matching field, indicating that the columnar defects are efficient pinning sites under these H and T conditions.
- PACS
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74.25.Qt Vortex lattices, flux pinning, flux creep
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
- Subjects
- Dates
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Issue 12 (December 2009)
Received 30 June 2009, in final form 15 September 2009
Published 23 October 2009
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The effect of columnar defects on the pinning properties of NdFeAsO0.85 conglomerate particles
J D Moore et al 2009 Supercond. Sci. Technol. 22 125023
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