Bulk samples were synthesized by using the usual solid-state reaction method. The alternating-current losses of the bulk sample were measured by using the alternating-current susceptibility system in external direct-current magnetic fields of up to 7T. The dependence of the losses upon temperature, frequency and magnitude of the alternating-current field was experimentally obtained. It was found that the mechanism of losses in the sample could be the same as that of high-TC superconductors and could be explained by flux creep models.

AC Losses of Superconductor MgB2. H.Luo, X.F.Wu, C.M.Lee, T.Yang, X.Leng, Y.Liu, L.Qiu, H.M.Luo, Z.H.Wang, S.Y.Ding: Superconductor Science and Technology, 2002, 15, 370-4