Critical current density of YBa[sub 2]Cu[sub 3]O[sub 7-δ] low-angle grain boundaries in self-field

Verebelyi, D. T.; Cantoni, C.; Budai, J. D.; Christen, D. K.; Kim, H. J.; Thompson, J. R.
April 2001
Applied Physics Letters;4/2/2001, Vol. 78 Issue 14, p2031
Academic Journal
A study has been perfomed on the superconducting critical current density J[sub c] flowing across low-angle grain boundaries in epitaxial thin films of YBa[sub 2]Cu[sub 3]O[sub 7-δ]. The materials studied were dual grain boundary rings deposited on SrTiO[sub 3] and containing 2°, 3°, 5°, and 7° tilt boundaries. The current density in self-field was determined by magnetometric methods at temperatures from 5 K to T[sub c]. We conclude that at the higher temperatures of coated conductor applications, there is limited potential for improving J[sub c] by reducing the grain boundary angle below ∼3°. © 2001 American Institute of Physics.


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