Abstract
Magnetization measurements performed on a Nb thin film have revealed the existence of a “second magnetization peak” (SMP) well below the upper critical field boundary H c2 (T). The results of this work provide clear evidence that the SMP originates from a thermomagnetic flux-jump instability. The similarity of the magnetization loops measured in Bi 2 Sr 2 CaCu 2 O 8 high-T c superconducting crystals to those in Nb, as well as their dependence on the crystal size and field step indicate that a common mechanism is responsible for the SMP in these superconductors.
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