Critical current properties were carefully clarified for Co-doped ErBa 2Cu3Oy (Er123) films grown by pulse laser deposition. Co-doped Er123 films with various Co doping levels have been successfully fabricated by controlling substrate temperature (Ts). Critical temperatures (Tc) were decreased with a decrease in T s, which means that the Co-doping levels into the CuO2 plane can be controlled by Ts. It was found from J c-θ plots for relatively heavily Co-doped films that c-axis-correlated vortex pinning centers were introduced by the Co-doping. The inhomogeneous distribution of Co ions in films probably plays a key role in the improvement of the new type of pinning center.
|ジャーナル||Japanese Journal of Applied Physics, Part 2: Letters|
|出版ステータス||出版済み - 6 16 2006|
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