Alternating transport-current flow in superconductive films: The role of a geometrical barrier to vortex motion

H. R. Kerchner, D. P. Norton, A. Goyal, J. D. Budai, D. K. Christen, D. M. Kroeger, M. Paranthaman, D. F. Lee, F. A. List, R. Feenstra, E. H. Brandt

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

YBa2Cu3O7-δfilms grown on both SrTiO3single-crystal and rolling-assisted biaxially textured (Ni) substrates (RABiTS) carry high critical current densities Jc. A geometrical barrier to vortex motion raises the apparent Jc, but also increases power loss associated with ac transport current through such tape above that expected from Norris’s 1970 theory of hysteretic energy loss. Present theoretical estimates of the geometrical barrier have insufficient magnitude to account for our observations at low ac current levels. Evidence is reported that the ferromagnetic Ni substrate makes no significant contribution to the tape self-field loss. Loss is enhanced, and Jcmodestly reduced by the presence of low-angle grain boundaries. Application of dc magnetic field further lowers Jcand raises loss in films.

Original languageEnglish
Pages (from-to)6878-6883
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume60
Issue number9
DOIs
StatePublished - 1999

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