Abstract
An oxypnictide superconductorNdFeAsO0.85 sample with transition temperature of 46 K was irradiated with 2 GeV Ta ions at a fluence of5 × 1010 ions cm−2. High resolution transmission electron microscopy study revealed that theirradiation produced columnar-like defects. The effect of these defects on theirreversible magnetization in polycrystalline randomly oriented fragments wasstudied as a function of field angle and field sweep rate. We find that the criticalcurrent density is moderately enhanced at fields below the matching field (∼1 T). The pinning enhancement is anisotropic and maximum along the defectdirection 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 theseH andT conditions.
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