Abstract
We report the results of an investigation of the influence of magnetic fields on hysteretic ac losses inbulk MgB2 superconductor by using Hall probe ac susceptibility. The external magnetic fieldin this study had an ac part with frequency 10 Hz and magnitude in the range240–1200 A m−1 and no dc part. We have measured the imaginary part of the magnetic susceptibility andanalysed data by using Bean’s critical state model of cylindrical geometry for fourdifferent temperature values 39.55, 39.51, 39.47 and 39.41 K. The result of thisanalysis indicates that Bean’s model is adequate to explain the experimentalfindings. Calculated hysteretic ac loss versus applied magnetic field curve is given byusing the critical state model. We have also measured the magnetization versusapplied magnetic field and determined the first critical magnetic field of aMgB2 sampleas 500 A m−1 at 35 K.
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