Current Transport Across Grain Boundaries in Tlba2Ca2Cu30X Thick Polycrystalline Films and Yba2Cu307 Step Edges

J. D. Hettinger, D. H. Kim, D. J. Miller, J. G. Hu, K. E. Gray, J. E. Sharping, K. Daly, C. Pettiette-Hall, J. E. Tkaczyk, J. Deluca

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Abstract

We have performed transport measurements in magnetic fields (H//c) up to 10T on a series of YBa2Cu3U7 grain boundaries induced by epitaxial growth on a substrate containing a series of step edges. For this material we find an activation energy which goes as U(T)~(l-t). Electric field versus current density curves taken at a constant temperature while varying the magnetic field allows a determination of the magnetic field dependence of the activation energy using the Ambagaokar-Halperin model. These values agree with results extracted from the resistive transitions. Similar characterizations of a sample of TlBa2Ca2Cu30x are also presented. The temperature dependence of the activation energy for this system may be summarized as U(T)~(l-t)2, suggesting that the grain boundaries behave as SNS juctions.

Original languageEnglish (US)
Pages (from-to)1211-1214
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume3
Issue number1
DOIs
StatePublished - Mar 1993

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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    Hettinger, J. D., Kim, D. H., Miller, D. J., Hu, J. G., Gray, K. E., Sharping, J. E., Daly, K., Pettiette-Hall, C., Tkaczyk, J. E., & Deluca, J. (1993). Current Transport Across Grain Boundaries in Tlba2Ca2Cu30X Thick Polycrystalline Films and Yba2Cu307 Step Edges. IEEE Transactions on Applied Superconductivity, 3(1), 1211-1214. https://doi.org/10.1109/77.233408