Abstract
The uniaxial strain dependence of the critical current was examined for YBCO coated conductors withIBAD-CeO2/YSZ or ISD-MgO buffer layers on Hastelloy substrates.Ic increased with increasing applied strain, reached a maximum anddecreased for higher strain values. The reversible strain region ofIc variation was observed. The reversible strain limit depends on the buffer layers. For theCeO2/YSZ bufferedtape, Ic recovered the initial value even after the applied strain reached0.30%. On the other hand, an irreversible degradation ofIc wasobserved at the strain less than 0.22% for the MgO buffered tape. The overall relationship betweenthe Ic normalized by the peak value and the intrinsic strain in YBCO obeyed a unified scalingfunction. Quenching occurred at the strain close to the yield strain of the Hastelloysubstrate.
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