Magnetization studies on superconducting MgB₂ - lower and upper critical fields and critical current density

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Magnetization studies have been carried out on superconducting MgB₂ (Tc=37K) in the temperature range of 2-50K and in magnetic field up to 5 Tesla. From these measurements, values of the lower critical field Hc1(0), upper critical field Hc2(0) at zero K are estimated to be 300 Oe and 12.5 Tesla, respectively, which yield a value of 26 for the Ginzburg-Landau parameter, k. Magnetization hysteresis loops have been obtained at various temperatures from which the magnetization critical current density is estimated using Bean's critical state model.