Abstract
For the purpose of plotting the H-T diagram for MgB 2 granular superconductors, the behavior of electrical resistivity-versus-temperature dependences were studied at ∼ 35 to ∼ 45K in external magnetic fields with magnetic field strengths H ext up to ∼ 2kOe. The effect of increasing the superconductivity transition width ΔT c at increased H ext has been revealed. A model has been developed for superconductivity transitions in a two-level system. The data obtained allowed establishing the existence of a weak links system in MgB 2 granular superconductors.
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