C -axis critical current density of second-generation YBCO tapes

C -axis critical current density of second-generation YBCO tapes. Jia, Y., Hua, J., Crabtree, G. W., Kwok, W. K., Welp, U., Malozemoff, A. P., Rupich, M., & Fleshler, S. Superconductor Science and Technology, 23(11):115017, 2010.

Paper abstract bibtex

We report on measurements of the temperature and field dependence of the c -axis critical current density ( J c c ) obtained on mesa structures that were patterned into the YBCO layer of second-generation HTS tapes. We find the J c c ---values of ~ 4 kA cm − 2 at 77 K and self-field, corresponding to an unexpectedly high anisotropy in the critical current density J c ab / J c c of 500--600. C -axis current flow is expected to arise in applications such as the helically wound wires in HTS cables. A simple estimate is given of the fraction of tape width for such a c -axis flow; while in our samples this fraction is approximately 5% for a typical geometry, the fraction will grow linearly with increasing current density anisotropy and could affect the current-carrying ability of the tape.

@article{ Yia:SST10,
  abstract = {We report on measurements of the temperature and field dependence of the c -axis critical current density ( J c c ) obtained on mesa structures that were patterned into the YBCO layer of second-generation HTS tapes. We find the J c c ---values of ~ 4 kA cm − 2 at 77 K and self-field, corresponding to an unexpectedly high anisotropy in the critical current density J c ab / J c c of 500--600. C -axis current flow is expected to arise in applications such as the helically wound wires in HTS cables. A simple estimate is given of the fraction of tape width for such a c -axis flow; while in our samples this fraction is approximately 5% for a typical geometry, the fraction will grow linearly with increasing current density anisotropy and could affect the current-carrying ability of the tape.},
  author = {Y. Jia and J. Hua and G. W. Crabtree and W. K. Kwok and U. Welp and A. P. Malozemoff and M. Rupich and S. Fleshler},
  date-added = {2012-02-23 18:15:43 +0100},
  date-modified = {2012-02-23 18:17:54 +0100},
  journal = {Superconductor Science and Technology},
  number = {11},
  pages = {115017},
  title = {C -axis critical current density of second-generation YBCO tapes},
  url = {http://stacks.iop.org/0953-2048/23/i=11/a=115017},
  volume = {23},
  year = {2010},
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}

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