Effects of substrate on the superconducting properties and ferromagnetic loss in RABiTS coated conductors

ORAL

Abstract

Given the substantial progress in the fabrication of coated conductors, considerable attention is now being directed to studying and understanding the ferromagnetic loss that arise from the substrates. Rolling Assisted Biaxially Textured Substrates (RABiTS) coated conductors (CC) use alloys of NiW as the preferred substrate during fabrication. In this work, we have made magnetic measurements on a set of RABiTS CC with different composition of NiW alloy in order to determine the amount of ferromagnetic loss from the substrates. We also report on the magnetometric studies of the critical current density $J_c$ flowing in the thin $YBa_2Cu_3O_{7-\delta}$ (YBCO) films that were deposited on these substrates. The $J_c$ were determined both as a function of applied field $H$ and temperature $T$. Isothermal magnetization loops $M(H; T)$ and remanent magnetization $M_{rem} (T)$ in zero applied field $H = 0$, were measured with $H$ parallel to the c axis (i.e., normal to film plane). For a wide range of temperatures and intermediate fields, we find a power law falloff $J_c \propto H^{-\beta}$ with $\beta$ $\sim$ (0.56 - 0.69) for all materials. For higher temperatures approaching the irreversibility line, we find $J_c (T, sf) \propto (1-T/Tc)^n$ with n $\sim$ 1.1 - 1.3.

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Authors

  • Anota Ijaduola

    University of North Georgia, Dahlonega GA 30597, University of North Georgia

  • Richard Longland

    University of Tennessee, Knoxville, University of Alabama at Birmingham, Rutgers, The State University of New Jersey, Florida Intl Univ, Christopher Newport University, Jefferson Laboratory, University of North Georgia, Dahlonega GA 30597, Oak Ridge National Laboratory, Oak Ridge, TN 37831, Austin Peay State University department of physics and astronomy, Laboratoire des Verres et et Ceramiques, Institute des Sciences chimiques de Rennes, Austin Peay State University Department of Physics and Astronomy, Université de Rennes, Lehigh University, Austin Peay State University, University of Alabama, Oak Ridge National Laboratory, Auburn University, Auburn, AL, Purdue University, West Lafayette, IN, Queen's University Belfast, Belfast, United Kingdom, Harvard Smithsonian Center for Astrophysics, Boston, MA, Francis Marion University, Auburn University, Lawrence Berkeley National Laboratory, University of California, Davis, University of Alabama Huntsville, Oak Ridge National Lab, Univ of Tennessee, Knoxville, Oak Ridge National Lab, Univ of Tennessee, Knoxville, ITEP, Moscow, Baylor University, Saint Louis University, Louisiana State Univ - Baton Rouge, University of Chicago, Oak Ridge National Laboratory , Oak Ridge TN 37831, American Superconductor Corp., Westborough, MA 01581, USA, Tsinghua University, LBNL, Vanderbilt University, Laboratoire Aime Cotton, CNRS/Universite Paris-Sud/ENS-Cachan, Orsay France, Drake University, Des Moines, IA, University of Central Florida, University of South Alabama, North Carolina Central University

  • Richard Longland

    University of Tennessee, Knoxville, University of Alabama at Birmingham, Rutgers, The State University of New Jersey, Florida Intl Univ, Christopher Newport University, Jefferson Laboratory, University of North Georgia, Dahlonega GA 30597, Oak Ridge National Laboratory, Oak Ridge, TN 37831, Austin Peay State University department of physics and astronomy, Laboratoire des Verres et et Ceramiques, Institute des Sciences chimiques de Rennes, Austin Peay State University Department of Physics and Astronomy, Université de Rennes, Lehigh University, Austin Peay State University, University of Alabama, Oak Ridge National Laboratory, Auburn University, Auburn, AL, Purdue University, West Lafayette, IN, Queen's University Belfast, Belfast, United Kingdom, Harvard Smithsonian Center for Astrophysics, Boston, MA, Francis Marion University, Auburn University, Lawrence Berkeley National Laboratory, University of California, Davis, University of Alabama Huntsville, Oak Ridge National Lab, Univ of Tennessee, Knoxville, Oak Ridge National Lab, Univ of Tennessee, Knoxville, ITEP, Moscow, Baylor University, Saint Louis University, Louisiana State Univ - Baton Rouge, University of Chicago, Oak Ridge National Laboratory , Oak Ridge TN 37831, American Superconductor Corp., Westborough, MA 01581, USA, Tsinghua University, LBNL, Vanderbilt University, Laboratoire Aime Cotton, CNRS/Universite Paris-Sud/ENS-Cachan, Orsay France, Drake University, Des Moines, IA, University of Central Florida, University of South Alabama, North Carolina Central University

  • Richard Longland

    University of Tennessee, Knoxville, University of Alabama at Birmingham, Rutgers, The State University of New Jersey, Florida Intl Univ, Christopher Newport University, Jefferson Laboratory, University of North Georgia, Dahlonega GA 30597, Oak Ridge National Laboratory, Oak Ridge, TN 37831, Austin Peay State University department of physics and astronomy, Laboratoire des Verres et et Ceramiques, Institute des Sciences chimiques de Rennes, Austin Peay State University Department of Physics and Astronomy, Université de Rennes, Lehigh University, Austin Peay State University, University of Alabama, Oak Ridge National Laboratory, Auburn University, Auburn, AL, Purdue University, West Lafayette, IN, Queen's University Belfast, Belfast, United Kingdom, Harvard Smithsonian Center for Astrophysics, Boston, MA, Francis Marion University, Auburn University, Lawrence Berkeley National Laboratory, University of California, Davis, University of Alabama Huntsville, Oak Ridge National Lab, Univ of Tennessee, Knoxville, Oak Ridge National Lab, Univ of Tennessee, Knoxville, ITEP, Moscow, Baylor University, Saint Louis University, Louisiana State Univ - Baton Rouge, University of Chicago, Oak Ridge National Laboratory , Oak Ridge TN 37831, American Superconductor Corp., Westborough, MA 01581, USA, Tsinghua University, LBNL, Vanderbilt University, Laboratoire Aime Cotton, CNRS/Universite Paris-Sud/ENS-Cachan, Orsay France, Drake University, Des Moines, IA, University of Central Florida, University of South Alabama, North Carolina Central University