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Optimizing vortex pinning in YBa2Cu3O7-x superconducting films up to high magnetic fields
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Journal Article
Optimizing vortex pinning in YBa2Cu3O7-x superconducting films up to high magnetic fields
2022
Overview
The magnetic flux pinning capabilities of YBa
2
Cu
3
O
7-x
(YBCO) coated conductors vary strongly across different regions of the magnetic field–temperature phase diagram and with the orientation of the magnetic field
θ
. Here, we determine the optimal pinning landscape for a given region of the phase diagram by investigating the critical current density
J
c
(
H
,
θ
,
T
) in the 5–77 K temperature range, from self-field to high magnetic fields of 35 T. Our systematic analysis reveals promising routes for artificially engineering YBCO coated conductors in any region of interest of the phase diagram. In solution-derived nanocomposites, we identify the relevance of coexisting high amounts of short stacking faults, Cu-O vacancy clusters, and segmentation of twin boundaries, in combination with nanoparticles, for enhanced pinning performance at high magnetic fields and low temperatures. Moreover, we demonstrate that twin boundaries preserve a high pinning energy in thick YBCO films, which is beneficial for the pinning performance at high magnetic fields and high temperatures.
Optimizing the microstructure of YBa
2
Cu
3
O
7-x
coated conductors across the magnetic field–temperature phase diagram is important for strengthening vortex pinning and thereby enhancing the critical current. Here, a systematic microstructural investigation identifies the most relevant vortex pinning contributions in a broad range of temperatures and magnetic fields.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
