Suppression of vortex channeling in meandered YBa2Cu3O7-d grain boundaries
J. H. Durrell, D. M. Feldmann, C. Cantoni
TL;DR
This study investigates how meandered grain boundaries in YBa2Cu3O7-d superconductors suppress vortex channeling, leading to improved critical current density under magnetic fields compared to straight boundaries.
Contribution
It demonstrates that meandered grain boundaries prevent vortex channeling, a phenomenon observed in straight boundaries, thus enhancing superconductor performance.
Findings
Meandered GBs do not exhibit vortex channeling.
Straight GBs show flux channeling near the GB plane.
Meandered GBs maintain higher Jc under magnetic fields.
Abstract
We report on the in-plane magnetic field (H) dependence of the critical current density (Jc) in meandered and planar single grain boundaries (GBs) isolated in YBa2Cu3O7-d (YBCO) coated conductors. The Jc(H)properties of the planar GB are consistent with those previously seen in single GBs of YBCO films grown on SrTiO3 bi-crystals. In the straight boundary a characteristic flux channeling regime when H is oriented near the GB plane, associated with a reduced Jc, is seen. The meandered GB does not show vortex channeling since it is not possible for a sufficient length of vortex line to lie within it.
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