Electrical and magnetic properties of conductive Cu-based coated conductors

Aytug, T.; Paranthaman, M.; Thompson, J.R.; Goyal, A.; Rutter, N.; Zhai, H.Y.; Gapud, A.A.; Ijaduola, A.O.; Christen, D.K.
November 2003
Applied Physics Letters;11/10/2003, Vol. 83 Issue 19, p3963
Academic Journal
The development of YBa[sub 2]Cu[sub 3]O[sub 7-δ] (YBCO)-based coated conductors for electric power applications will require electrical and thermal stabilization of the high-temperature superconducting (HTS) coating. In addition, nonmagnetic tape substrates are an important factor in order to reduce the ferromagnetic hysteresis energy loss in ac applications. We report progress toward a conductive buffer layer architecture on biaxially textured nonmagnetic Cu tapes to electrically couple the HTS layer to the underlying metal substrate. A protective Ni overlayer, followed by a single buffer layer of La[sub 0.7]Sr[sub 0.3]MnO[sub 3], was employed to avoid Cu diffusion and to improve oxidation resistance of the substrate. Property characterizations of YBCO films on short prototype samples revealed self-field critical current density (J[sub c]) values exceeding 2×10[sup 6] A/cm[sup 2] at 77 K and good electrical connectivity. Magnetic hysteretic loss due to Ni overlayer was also investigated. © 2003 American Institute of Physics.


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