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Investigation of voltage steps of U(I) curves in PbMo6S8 wires

Zuccone, J.
Grill, R.
Perenboom, J.A.A.J.
Published in Physica C: Superconductivity and Its Applications. 1992, vol. 202, no. 1-2, p. 61-68
Abstract We have investigated hot-drawn PbMo6S8 composite monofilament wires (Jc = 4.6x108A/m2atμ0H = 10 TandT = 4.2 K) in particular steps that occur in the I-U transition curves. These steps have been measured in fields up to 9 T and in a temperature range between 2 K and 10 K. We have analyzed them by considering two models, the hot spot model and the phase-slip model. Furthermore, a flux flow channel picture is developed, where the step is related to an avalanche of flux flow localised in a narrow channel. The observed field dependence of the step in a field applied transversally to the wire can be understood within this description. All these model considerations concur; the origin of the steps appears to lie in local defects with a μm length-scale. Just a few of these defects may already depress the overall critical current in a substantial way. Taking into account this situation, there exists an important potential for further improvements of the critical current in PbMo6S8 wires.
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HERRMANN, Peter Friedrich et al. Investigation of voltage steps of U(I) curves in PbMo6S8 wires. In: Physica C: Superconductivity and Its Applications, 1992, vol. 202, n° 1-2, p. 61-68. https://archive-ouverte.unige.ch/unige:104496

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Deposited on : 2018-05-15

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