Abstract
ErBa2Cu3Oy (ErBCO) thinfilms with BaZrO3 (BZO) nanorods were prepared by a PLD method for an enhancement of the critical current densityJc. Thevalues of Jc for the ErBCO thin film containing 1.5 wt% BZO (Er15) in magnetic fields are higher thanthose for the ErBCO thin film containing 0.5 wt% BZO (Er05). The peaks ofJc have been observed in the angular dependence ofJc in both the films when the magnetic field is applied parallel to thec-axis.It has been found that the peak is attributed to the flux pinning by BZO nanorods oriented parallel tothe c-axis. The vortex glass–liquid transition temperatureTg and the pinningparameter m were derived by fitting observed electric transport properties to thetheoretical expression based on the percolation transition model. The value ofTg of Er15 is higher than that of Er05. This result indicates that the vortex glass phaseextends to a higher temperature region on increasing the fraction of BZO. The peak ofm has been found in the magnetic field dependence. This fact is probably due to matching thedensity of BZO nanorods with that of fluxoids, which was confirmed by TEM observations.
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