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Critical current enhancement in PLD YBa2Cu3O7−x films using artificial pinning centers

✍ Scribed by P. Mele; K. Matsumoto; T. Horide; O. Miura; A. Ichinose; M. Mukaida; Y. Yoshida; S. Horii

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
346 KB
Volume
445-448
Category
Article
ISSN
0921-4534

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✦ Synopsis

We introduced high-density columnar defects as artificial pinning centers (APCs) for quantized vortices into YBa 2 Cu 3 O 7Àx (YBCO) films during the film deposition procedure. APCs were introduced perpendicular to the film surface using nano-sized Y 2 O 3 islands prepared on SrTiO 3 (1 0 0) substrates. Varying the deposition parameters and the substrate annealing conditions allowed strong changes in the shape and density of the Y 2 O 3 islands to be induced. Compared to a pure YBCO film, the best performance among the APCs samples was obtained on the Y 2 O 3 -deposited substrate with 5 laser pulses, corresponding to a nominal thickness of 0.2 nm. Even when the APC films were prepared using the same deposition conditions, the columnar defects enhanced J c at 77 K from 1.8 to 2.7 MA/cm 2 (self field) and from 0.06 to 0.10 MA/cm 2 (H = 5 T, Hkc-axis).

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