Experimental determination of two-dimensional critical current density distribution in YBCO coated conductors

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Abstract
The critical current density (Jc) distribution in YBCO coated conductors is attracting interest from the viewpoint of its influence on their AC loss characteristics as well as from material science and process engineering. A two-dimensional Jc distribution in a YBCO coated conductor made by the IBAD (ion-beam assisted deposition) and the PLD (pulse-laser deposition) method can be determined by the magnetic-knife method with spatial resolutions of 0.2 mm lateral and 10 mm longitudinal directions, respectively. In an up-to-date 80A-class YBCO coated conductor, the Jc is relatively uniform in the central part and reaches \mbox{7$×$109 A m-2, } while the Jc fluctuates spatially in the central part of a tape fabricated earlier and with less critical current. Near the edges of the tapes, the Jc is higher or lower than in the central part and the experimentally determined Jc distributions are far from uniform. This suggests that a presumption of a uniform Jc for AC loss estimations is not always reasonable and can lead to a large error in the estimated AC losses.

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