Abstract
Magnetizations and AC susceptibilities were measured on powdered new superconductor MgB2 using an SQUID magnetometer and a PPMS susceptometer at temperature range 4.5–40 K under DC magnetic fields up to 14 T. Particle diameters d of powdered MgB2 specimens are 20<d<30 μm (MgB2-20) and 50<d<63 μm (MgB2-50). Magnetization curve for MgB2-50 sample is symmetric and larger than that for MgB2-20 sample. The irreversibility fields are determined by the width of magnetization curves and the imaginary parts of the AC susceptibilities. Temperature dependence of the irreversibility field almost agrees for both powder samples and is smaller than that of oxide superconductors. In addition these characteristics are also discussed by comparing with the flux creep theory.
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