Abstract
We investigate the field, angle and temperature dependence of the full-width critical current, Ic, of pulsed laser deposition-grown GdBa2Cu3O7 coated conductors with and without additional 6 mol% BaSnO3 (BSO) nanoparticles fabricated by SuperOx. The transport characteristics measured from 7 to 77 K and in applied magnetic fields of up to 6 T are complemented by scanning transmission electron microscopy. This combined approach allows for further insight into the vortex pinning mechanism and helps with understanding the enhancement in Ic. An exemplary scaling of the pinning force curves versus field at different temperatures confirms the additional contribution to pinning by the BSO nanoparticles. Through the temperature dependence of Ic, the weak and strong pinning contributions are determined: strong pinning dominates over almost the entire temperature range especially near the matching field of 1 T, where the largest enhancement in Ic is achieved.
Highlights
We investigate the field, angle and temperature dependence of the full-width critical current, Ic, of pulsed laser deposition-grown GdBa2Cu3O7 coated conductors with and without additional 6 mol% BaSnO3 (BSO) nanoparticles fabricated by SuperOx
We investigated in detail the field, temperature and angle dependence of the critical current, Ic(B, T, θ), of artificial pinning centers (APC)-added tapes from SuperOx at intermediate temperatures between liquid helium (4.2 K) and liquid nitrogen (77 K) temperatures and at moderate fields of up to 6 T
pulsed laser deposition (PLD)-GdBCO coated conductors fabricated by SuperOx with and without an additional 6 mol% BaSnO3 phase were examined by scanning transmission electron microscopy (STEM) and transport measurements
Summary
93.1 92.1 92.3 current density, Jc, for reviews see [1, 2] These physical defects are a few nanometer in size and are either related to the deposition process such as grain boundaries, oxygen vacancies, and dislocations or artificially introduced, e.g. nanosized precipitates that form by addition of secondary phases. The anisotropy of Jc with regard to the direction of the applied magnetic field can be reduced. It is very tempting for coated conductor manufacturers to incorporate artificial pinning centers (APC) using secondary phases to improve the in-field performance of their tapes [6,7,8]. It is important to optimize the critical current Ic, rather than the current density Jc, and to tailor it for a specific target operating temperature
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