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The DC magnetization and AC complex magnetic susceptibilities were measuredfor MgB2 single crystals, unsubstituted and carbon substituted with thecomposition of Mg(B_0.94C_0.06)2. The measurements were performed in AC and DCmagnetic fields oriented parallel to the c-axis of the crystals. From the DCmagnetization loops and the AC susceptibility measurements, critical currentdensities (Jc) were derived as a function of temperature and the DC and ACmagnetic fields. Results show that the substitution with carbon decreases Jc atlow magnetic fields, opposite to the well known effect of an increase of Jc athigher fields. AC magnetic losses were derived from the AC susceptibility dataas a function of amplitude and the DC bias magnetic field. The AC losses weredetermined for temperatures of 0.6 and 0.7 of the transition temperature Tc, soclose to the boiling points of LH2 and LNe, potential cooling media formagnesium diboride based composites. The results are analyzed and discussed inthe context of the critical state model.

Influence of the carbon substitution on the critical current density and AC losses in MgB2 single crystals