Abstract
A relationship between microstructures ofYBa2Cu3Oy (Y123)films with two-dimensional artificial pinning centers (2D APCs) and their critical current density (Jc), especially undermatching fields (Bϕ), is discussed. Using a pulsed laser deposition (PLD) method,c-axis in-planealigned a-axis-oriented Y123/Pr123 multilayer films were grown on substrates. ThePr123 interlayer distance was changed by controlling a target shape and itsrotation speed in the PLD process. The multilayer structure was observed incross-sectional transmission electron microscopy images. Critical temperaturesof the films decrease as the Y123 layer becomes thinner. The magnetic field (B) dependenceof Jc showed that the interlayers act as 2D APCs in multilayer films. The matchingeffects were observed in two ways: curves and irreversibility lines.
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