Abstract
Effects of growth temperatures in epitaxialErBa2Cu3O7−δ filmswith one-dimensional nanorods were discussed from their microstructures and superconducting properties.c-axis-orientedBaNb2O6-dopedErBa2Cu3O7−δ films were grown on(100)-oriented SrTiO3 substratesgrown at 710 and 760 °C by pulsed-laser deposition. Atomic force microscopy analysis showed that film surface stepson the three-dimensional islands increased with decreasing growth temperature (TS). Then, nanorod morphologies were also changed byTS.Ba(Er0.5Nb0.5)O3 nanorods were observed clearly in transmission electron microscopyimages of the films. The nanorods were thinner and denser at a lowerTS under anominal BaNb2O6 (BNO) doping concentration. In the case ofTS = 710 °C, the diameter and number density of nanorods with 1.5 wt%BNO doping were 4–6 nm and2.6 × 1011 cm−2, respectively. Furthermore, the nanorods could effectively act asc-axis-correlated pinning centers in the film grown at a lowerTS.Consequently, the pinning effects were controlled by nanorod morphologies through varying theTS.
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