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Study of the Flux Pinning Landscape of YBCO Thin Films With Single and Mixed Phase Additions BaMO3 + Z: M = Hf, Sn, Zr and Z = Y2O3, Y211

Addition of nanophase defects to YBa2Cu3O7 (YBCO) superconductor thin films enhances flux pinning, resulting in an increase in transport current densities (Jct). While previous studies focused on single-phase additions such as BaSnO 3 , BaZrO 3 , and Y 2 BaCuO 5 (Y211); the addition of several phase...

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Published in:IEEE transactions on applied superconductivity 2017-06, Vol.27 (4), p.1-5
Main Authors: Sebastian, Mary Ann P., Reichart, Joshua N., Ratcliff, Margaret M., Bullard, Thomas J., Burke, Jack L., Ebbing, Charles R., Panasyuk, George Y., Chen-Fong Tsai, Wenrui Zhang, Jijie Huang, Haiyan Wang, Wu, Judy, Haugan, Timothy J.
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cited_by cdi_FETCH-LOGICAL-c356t-51b168711d9abfd502333c899965680d9d8f128ff421e56062a16a350de35ad63
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creator Sebastian, Mary Ann P.
Reichart, Joshua N.
Ratcliff, Margaret M.
Bullard, Thomas J.
Burke, Jack L.
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Wenrui Zhang
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Haugan, Timothy J.
description Addition of nanophase defects to YBa2Cu3O7 (YBCO) superconductor thin films enhances flux pinning, resulting in an increase in transport current densities (Jct). While previous studies focused on single-phase additions such as BaSnO 3 , BaZrO 3 , and Y 2 BaCuO 5 (Y211); the addition of several phases simultaneously has shown strong improvements by combining different flux pinning mechanisms. This paper further explores and compares the effect of mixed-phase nanoparticle pinning, with the addition of insulating, nonreactive phases of: 1) BaSnO 3 + Y 2 O 3 , 2) BaSnO 3 + Y211, 3) BaZrO 3 + Y 2 O 3 , and 4) BaHfO 3 + Y 2 O 3 . Processing parameters vary the doped YBCO single target volume percent of either BaHfO 3 , BaSnO 3 , or BaZrO 3 , while maintaining either Y 2 O 3 or Y211 constant at 3 vol.%. Pulsed laser deposition produces films on LaAlO 3 and SrTiO 3 substrates at deposition temperatures of 750-840 °C. Current density is measured for fields ranging from H = 0-9 T with H // c, and temperatures from 5 to 77 K, providing a detailed picture of pinning effects. Optimized results of flux pinning, magnetic current densities J cm (H, T), critical transition temperatures (T c ), lattice parameters, and microstructures are presented. The temperature dependence of the current density, J c (T), is mathematically modeled to compare the isotropic weak and anisotropic strong pinning contributions, for each of the mixed phase systems studied.
doi_str_mv 10.1109/TASC.2017.2652301
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Optimized results of flux pinning, magnetic current densities J cm (H, T), critical transition temperatures (T c ), lattice parameters, and microstructures are presented. 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source IEEE Electronic Library (IEL) Journals
subjects Critical current density
Current density
data models
Flux pinning
Lattices
Nanoparticles
superconducting thin films
Temperature measurement
Yttrium barium copper oxide
title Study of the Flux Pinning Landscape of YBCO Thin Films With Single and Mixed Phase Additions BaMO3 + Z: M = Hf, Sn, Zr and Z = Y2O3, Y211
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