Abstract
We have characterized bulk and local magnetic properties of iron-based oxypnictide superconductor SmFeAsO 0.7 F 0.3 polycrystalline sample ( T c ∼53 K) synthesized at ambient pressure and NdFeAsO 0.7 ( T c ∼52 K) synthesized at high pressure by using SQUID magnetometer, micro-Hall probe, and magneto-optical imaging technique. Intragranular critical current densities evaluated from bulk magnetization and local magnetic profile give values of about 1×10 5 A/cm 2 at 10 K in both compounds. Magnetic field profiles of both samples are far from Bean-like, suggesting that intergrain connection is not strong. Low-field characteristics including flux-penetration field are measured by using a micro-Hall probe. Obtained results are compared with data on high temperature superconductors.
Published Version
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