Open AccessFlux Pinning Enhancements of YBa2Cu3O7-x with Nanosize Magnetic Additions
Author(s) -
Mary Ann Sebastian,
Neal Pierce,
I. Maartense,
Gregory Kozlowski,
Timothy J. Haugan
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/756/1/012026
Subject(s) - flux pinning , superconductivity , materials science , condensed matter physics , critical current , pinning force , magnetic flux , magnetic field , phase (matter) , meissner effect , flux (metallurgy) , oxide , yttrium barium copper oxide , high temperature superconductivity , superdiamagnetism , metallurgy , chemistry , physics , organic chemistry , quantum mechanics
Different methods of flux pinning are being tested world-wide to enhance critical currents (I c s) of high temperature superconductor YBa 2 Cu 3 O 7-x (YBCO) coated conductors exposed to high magnetic fields. Magnetic materials are interesting to consider as flux pinning additions because of their potential for very strong pinning strength. To our knowledge, there have been limited demonstrations of magnetic pinning additions to YBCO conductors. This paper describes the study of different M magnetic phase additions to YBCO including M = BaFe 12 O 19 , La 0.67 Ca 0.33 MnO 3 , and other oxide phases. Nanosize additions were incorporated by depositing multilayer (M/YBCO) N films to minimize degradation of T c , and testing volume % additions of M phase from 0.5 % to 5%. Results indicate that T c onsets are depressed with magnetic additions, however in some cases interestingly without degrading the transition width. With optimization of magnetic additions a 50% increase of critical current density has been obtained, for low magnetic fields of < 10,000 Oe at 65K to 77K. Microstructural and superconducting properties are summarized, including SEM analysis.