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Superconducting and microstructural properties of [001] tilt YBa 2Cu3O7-δ thick film grain boundaries on SrTiO3 bicrystal substrates

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5 Author(s)
Li, Qiang ; Brookhaven Nat. Lab., Upton, NY, USA ; Zhu, Y. ; Solovyov, V.F. ; Wiesmann, H.J.
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We present a study of superconducting and microstructural properties of [001] tilt YBa2Cu3O7-δ (YBCO) thick film grain boundaries (GB) on SrTiO3 bicrystal substrates prepared using a BaF2 ex-situ post deposition reaction process. For a 15° tilt boundary, multiple microbridges were patterned across the grain boundary at various locations. A large variation of local critical current density Jc was observed. Through local microstructural characterization of these GB bridges using transmission electron microscopy (TEM), a direct correlation of local GB Jc with structure is identified

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Applied Superconductivity, IEEE Transactions on  (Volume:11 ,  Issue: 1 )