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Magnetic flux pinning enhancement in HgBa2CaCu2O6+δ films on vicinal substrates

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6 Author(s)
Xie, Y.Y. ; Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66045 ; Wu, J.Z. ; Yun, S.H. ; Emergo, R.
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High-temperature superconducting HgBa2CaCu2O6+δ films were fabricated on the vicinal surfaces of -miscut SrTiO3 single crystal substrates in a cation-exchange process, with the purpose to induce additional growth defects via a step-flow growth mode on the miscut substrates. The critical current densities (Jc) of these films were measured using a standard four-probe method with magnetic fields applied perpendicular to the film surface. The vicinal Hg-1212 films indeed showed higher Jc’s in magnetic fields and irreversibility fields (Hirr) than that on 0°-cut SrTiO3. Hirr at 77 K is 2.1 T for the film grown 0°-cut SrTiO3, and is enhanced to 2.7 T for the one grown on -miscut SrTiO3. If optimized so that the shape and the density of the defects can be controlled experimentally, this may be a promising way of improve magnetic flux pinning for many practical applications related to coated conductors.

Published in:

Applied Physics Letters  (Volume:85 ,  Issue: 1 )

Date of Publication:

Jul 2004

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