skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] films grown on both SrTiO[sub 3] single-crystal and rolling-assisted biaxially textured (Ni) substrates (RABiTS) carry high critical current densities J[sub c]. A geometrical barrier to vortex motion raises the apparent J[sub c], but also increases power loss associated with ac transport current through such tape above that expected from Norris[close quote]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 J[sub c] modestly reduced by the presence of low-angle grain boundaries. Application of dc magnetic field further lowers J[sub c] and raises loss in films. [copyright] [ital 1999] [ital The American Physical Society]

Authors:
; ; ; ; ; ; ; ; ;  [1];  [2]
  1. (Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6061 (United States))
  2. (Max Planck Institut fuer Metallforschung, D-70506, Stuttgart (Germany))
Publication Date:
OSTI Identifier:
6384546
Alternate Identifier(s):
OSTI ID: 6384546
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 60:9; Journal ID: ISSN 0163-1829
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BARIUM COMPOUNDS; BARIUM OXIDES; COPPER OXIDES; CRITICAL CURRENT; CURRENT DENSITY; ENERGY LOSSES; FERROMAGNETIC MATERIALS; GRAIN BOUNDARIES; HIGH-TC SUPERCONDUCTORS; HYSTERESIS; LOSSES; NICKEL; SUPERCONDUCTING FILMS; TEXTURE; VORTEX FLOW; YTTRIUM COMPOUNDS; YTTRIUM OXIDES; ALKALINE EARTH METAL COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; CURRENTS; ELECTRIC CURRENTS; ELEMENTS; FILMS; FLUID FLOW; MAGNETIC MATERIALS; MATERIALS; METALS; MICROSTRUCTURE; OXIDES; OXYGEN COMPOUNDS; SUPERCONDUCTORS; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS; TYPE-II SUPERCONDUCTORS 360204* -- Ceramics, Cermets, & Refractories-- Physical Properties

Citation Formats

Kerchner, H.R., Norton, D.P., Goyal, A., Budai, J.D., Christen, D.K., Kroeger, D.M., Paranthaman, M., Lee, D.F., List, F.A., Feenstra, R., and Brandt, E.H. Alternating transport-current flow in superconductive films: The role of a geometrical barrier to vortex motion. United States: N. p., 1999. Web. doi:10.1103/PhysRevB.60.6878.
Kerchner, H.R., Norton, D.P., Goyal, A., Budai, J.D., Christen, D.K., Kroeger, D.M., Paranthaman, M., Lee, D.F., List, F.A., Feenstra, R., & Brandt, E.H. Alternating transport-current flow in superconductive films: The role of a geometrical barrier to vortex motion. United States. doi:10.1103/PhysRevB.60.6878.
Kerchner, H.R., Norton, D.P., Goyal, A., Budai, J.D., Christen, D.K., Kroeger, D.M., Paranthaman, M., Lee, D.F., List, F.A., Feenstra, R., and Brandt, E.H. Wed . "Alternating transport-current flow in superconductive films: The role of a geometrical barrier to vortex motion". United States. doi:10.1103/PhysRevB.60.6878.
@article{osti_6384546,
title = {Alternating transport-current flow in superconductive films: The role of a geometrical barrier to vortex motion},
author = {Kerchner, H.R. and Norton, D.P. and Goyal, A. and Budai, J.D. and Christen, D.K. and Kroeger, D.M. and Paranthaman, M. and Lee, D.F. and List, F.A. and Feenstra, R. and Brandt, E.H.},
abstractNote = {YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] films grown on both SrTiO[sub 3] single-crystal and rolling-assisted biaxially textured (Ni) substrates (RABiTS) carry high critical current densities J[sub c]. A geometrical barrier to vortex motion raises the apparent J[sub c], but also increases power loss associated with ac transport current through such tape above that expected from Norris[close quote]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 J[sub c] modestly reduced by the presence of low-angle grain boundaries. Application of dc magnetic field further lowers J[sub c] and raises loss in films. [copyright] [ital 1999] [ital The American Physical Society]},
doi = {10.1103/PhysRevB.60.6878},
journal = {Physical Review, B: Condensed Matter},
issn = {0163-1829},
number = ,
volume = 60:9,
place = {United States},
year = {1999},
month = {9}
}