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Irreversibility line and flux flow noise in superconducting Nb-Ta

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4 Author(s)
Otabe, E.S. ; Dept. of Comput. Sci. & Electron., Kyushu Inst. of Technol., Iizuka, Japan ; Matsushita, T. ; Matsuno, T. ; Yamafuji, K.

It has been found that the critical current density, J c, in high-Tc oxide superconductors is reduced to zero at high temperatures and/or high magnetic fields even in a superconducting region. The irreversibility line was investigated in weakly pinned superconducting Nb-Ta with low Tc and was compared with that in oxide superconductors. Large flux flow noise with a peak around 0.3 Hz was observed in Nb-Ta specimens. The noise power integrated in the frequency range of 0.1-1.0 Hz had a sharp peak, when it was plotted against the magnetic field. The mechanism of such a characteristic noise is examined

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Magnetics, IEEE Transactions on  (Volume:27 ,  Issue: 2 )