Relationship between film thickness and the critical current of YBa2Cu3O7−δ-coated conductors

Applied Physics Letters - Tập 75 Số 23 - Trang 3692-3694 - 1999
S. R. Foltyn1, Q. X. Jia1, P. N. Arendt1, Lisa R. Kinder1, Y. Fan1, James F. Smith1
1Superconductivity Technology Center, Mail Stop K763, Los Alamos National Laboratory, Los Alamos New Mexico 87545

Tóm tắt

During the development of YBa2Cu3O7−δ (YBCO) coatings on flexible metal tapes, it has become evident that the achievable critical current (Ic) reaches a maximum value of about 200 A per cm of conductor width at a coating thickness of 1–2 μm. Additional YBCO beyond this thickness can actually reduce Ic. To investigate, critical current density (Jc) has been measured for samples with YBCO ranging from 0.39 to 6.3 μm in thickness. Several films were thinned by ion milling and remeasured with two significant results: almost no supercurrent is carried at thickness levels above 2 μm; and for films thicker than 3 μm, Jc is drastically reduced near the substrate as well.

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Applied Physics Letters

Tập 75 Số 23

3692-3694

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