Abstract
Properties of the transition into dissipative states of YBa 2Cu 3O 7− x /Au thin films are studied during sweep current and fault current limitation (FCL) experiments. Dissipation mechanisms associated with power laws behaviour E≈( J/ J c) n are observed and lead to a transition into the normal state by a thermal runaway. FCL experiments show that bilayer devices limit the current at about 2.5 J c and allow one to develop electric fields of about 3 kV/m without any damage. After the default regime, a recovery of the superconducting state under nominal current I n is for the first time reported. These results demonstrate the strong potential of YBCO/Au thin films as the superconducting fault current limiter elements that could be used autonomously in case of transient over-currents.
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