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Enhanced critical current density of YBa2Cu3Ox films grown on Nd1/3Eu1/3Gd1/3Ba2Cu3Ox with nano-undulated surface morphology

We report a simple and easily controllable method where a nano-undulated surface morphology of Nd1/3Eu1/3Gd1/3Ba2Cu3Ox (NEG) films leads to a substantial increase in the critical current density in superconducting YBa2Cu3Ox (YBCO) films deposited by pulsed laser deposition on such NEG layers. The enhancement is observed over a wide range of fields and temperatures. Transmission electron microscopy shows that such YBCO films possess a high density of localized areas, typically 20 x 20 nm2 in size, where distortion of atomic planes give rotational (2 to 5 degrees) moire patterns. Their distribution is random and uniform, and expected to be the origin of the enhanced flux pinning. Magneto-optical imaging shows that these films have excellent macroscopic magnetic uniformity.

preprint2005arXivOpen access
R. L. MengT. H. JohansenI. A. RusakovaA. BaikalovD. PhamF. ChenZ. Y. ZuoC. W. Chu
cond-mat.supr-con
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Open access8 authors1 topic
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R. L. MengT. H. JohansenI. A. RusakovaA. BaikalovD. PhamF. ChenZ. Y. ZuoC. W. Chu

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