Decoupling and tuning competing effects of different types of defects on flux creep in irradiated YBa2Cu3O7-δ coated conductors

Eley, S.; Leroux, M.; Rupich, M. W.; Miller, D. J.; Sheng, H.; Niraula, P. M.; Kayani, A.; Welp, U.; Kwok, W. -K.; Civale, L.

doi:10.1088/0953-2048/30/1/015010

Title: Decoupling and tuning competing effects of different types of defects on flux creep in irradiated YBa₂Cu₃O_7-δ coated conductors

Journal Article · Tue Nov 15 00:00:00 EST 2016 · Superconductor Science and Technology

DOI:https://doi.org/10.1088/0953-2048/30/1/015010· OSTI ID:1357762

Eley, S.; Leroux, M.; Rupich, M. W.; Miller, D. J.; Sheng, H.; Niraula, P. M.; Kayani, A.; Welp, U.; Kwok, W. -K.; Civale, L.

YBa₂Cu₃O_7-δ 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 ~20 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 O₂ at temperatures T _A = 250 °C–600 °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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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division; USDOE Office of Science - Energy Frontier Research Center - Center for Emergent Superconductivity; USDOE Office of Science - Office of Basic Energy Sciences - Scientific User Facilities Division

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1357762

Journal Information:: Superconductor Science and Technology, Vol. 30, Issue 1; ISSN 0953-2048

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

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