Abstract
The microstructures and electric transport properties across grain boundaries (GBs) are studied for YBaCuO bicrystal films grown by liquid phase epitaxy (LPE) method. Large single facet GBs with typical size of 10–100 μm are obtained in the films on MgO bicrystal substrates. Microstructures and atomic arrangements of GBs with different misorientation angles ϑ are investigated by TEM. The critical current densities across [001] tilt GBs as a function of ϑ show that J c values are almost constant up to ∼12° and then decrease exponentially, as usually observed for bicrystal films grown by physical vapor deposition methods. The presence of a plateau region up to 12° demonstrates a feature of the clean and meandering free GB structure in the LPE bicrystal films. The temperature and field dependencies of I c for 24° GB are presented and discussed based on the microstructures.
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