Abstract
We present magneto optical studies of the critical state in YBa2Cu3O7-δ (YBCO) thick films prepared using BaF2 ex-situ post reaction process. A distinctive fractal propagation pattern was observed as the magnetic flux entering the superconducting films, in a striking contrast to the behavior expected of a uniform type II superconducting film in the critical state. However, by averaging the flux density over a certain length scale, we found that flux penetration can be described with the standard Bean critical state model. The temperature dependence of critical current density J c was obtained by applying the Bean model to the averaged flux profiles, and found in good agreement with those obtained by direct transport measurements.
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Ye, Z.X., Li, Q., Suenaga, M., Solovyov, V.F. (2004). Magneto-Optical Studies of Ybco Thick Films in the Critical State. In: Johansen, T.H., Shantsev, D.V. (eds) Magneto-Optical Imaging. NATO Science Series, vol 142. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-1007-8_22
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DOI: https://doi.org/10.1007/978-94-007-1007-8_22
Publisher Name: Springer, Dordrecht
Print ISBN: 978-1-4020-1998-2
Online ISBN: 978-94-007-1007-8
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