Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 30, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-2048/30/1/015010
Keywords
superconductivity; magnetic relaxation; particle irradiation; vortex dynamics
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Funding
- US Department of Energy, Office of Science
- US Department of Energy, Office of Basic Energy Sciences
- US Department of Energy Office of Science User Facility [DE-AC02-06CH11357]
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YBa2Cu3O7-delta coated conductors (CCs) have achieved high critical current densities (J(c)) that can be further increased through the introduction of additional defects using particle irradiation. However, these gains are accompanied by increases in the flux creep rate, a manifestation of competition between the different types of defects. Here, we study this competition to better understand how to design pinning landscapes that simultaneously increase J(c) and reduce creep. CCs grown by metal organic deposition show non-monotonic changes in the temperature-dependent creep rate, S(T). Notably, in low fields, there is a conspicuous dip to low S as the temperature (T) increases from similar to 20 to similar to 65 K. Oxygen-, proton-, and Au-irradiation substantially increase S in this temperature range. Focusing on an oxygen-irradiated CC, we investigate the contribution of different types of irradiation-induced defects to the flux creep rate. Specifically, we study S(T) as we tune the relative density of point defects to larger defects by annealing both an as-grown and an irradiated CC in O-2 at temperatures T-A = 250 degrees C-600 degrees C. We observe a steady decrease in S(T > 20 K) with increasing T-A, unveiling the role of pre-existing nanoparticle precipitates in creating the dip in S(T) and point defects and clusters in increasing S at intermediate temperatures.
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