Near-isotropic enhancement of the 20 K critical current of REBa$_{\textrm{2}}$Cu$_{\textrm{3}}$O$_{\textrm{7}}$ coated conductors from columnar defects. Strickland, N. M., Wimbush, S. C., Soman, A. A., Long, N. J., Rupich, M. W., Knibbe, R., Li, M., Notthoff, C., & Kluth, P. Supercond. Sci. Technol., 36(5):055001, May, 2023.
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Paper doi abstract bibtex
Paper doi abstract bibtex Normal-incidence irradiation by 100 MeV Ag ions is used to improve flux pinning in previously optimised commercial REBCO tapes from the American Superconductor Corporation. We observe distinct critical-current anisotropy enhancements below and above 40 K. Above 40 K a strong c-axis peak appears in the angular dependence of the critical current, as is usually expected upon the introduction of columnar defects. The critical current is enhanced significantly but only for a limited range of field angles. Close to the parallel-field direction there is no enhancement or even a reduction in critical current. Below 40 K, on the other hand, the enhancement is much broader with respect to field angle, creating an almost isotropic response at 20 K, 3 T. The absence of a prominent c-axis peak does not indicate a lack of pinning, since the absolute value of the critical current still increases by a factor of 2.8 compared to an unirradiated sample. Instead, we postulate that pre-existing point-like pinning centres act to mediate an interaction between the existing planar and newly-introduced columnar pins, broadening both contributions. The point-like pins become less effective with increasing temperature as the coherence length increases, leading to a reduction in this interaction and a separation of the individual peaks relating to planar and columnar pins. At 20 K, we achieve an enhancement in the angular-minimum critical current by a factor of 2.7, in a material that had already been process-optimised for low-temperature pinning.
@article{strickland_near-isotropic_2023,
title = {Near-isotropic enhancement of the 20 {K} critical current of {REBa}$_{\textrm{2}}${Cu}$_{\textrm{3}}${O}$_{\textrm{7}}$ coated conductors from columnar defects},
volume = {36},
issn = {0953-2048, 1361-6668},
url = {/publications/10.1088/1361-6668/acbac6.pdf},
doi = {10.1088/1361-6668/acbac6},
abstract = {Normal-incidence irradiation by 100 MeV Ag ions is used to improve flux pinning in previously optimised commercial REBCO tapes from the American Superconductor Corporation. We observe distinct critical-current anisotropy enhancements below and above 40 K. Above 40 K a strong \textit{c}-axis peak appears in the angular dependence of the critical current, as is usually expected upon the introduction of columnar defects. The critical current is enhanced significantly but only for a limited range of field angles. Close to the parallel-field direction there is no enhancement or even a reduction in critical current. Below 40 K, on the other hand, the enhancement is much broader with respect to field angle, creating an almost isotropic response at 20 K, 3 T. The absence of a prominent \textit{c}-axis peak does not indicate a lack of pinning, since the absolute value of the critical current still increases by a factor of 2.8 compared to an unirradiated sample. Instead, we postulate that pre-existing point-like pinning centres act to mediate an interaction between the existing planar and newly-introduced columnar pins, broadening both contributions. The point-like pins become less effective with increasing temperature as the coherence length increases, leading to a reduction in this interaction and a separation of the individual peaks relating to planar and columnar pins. At 20 K, we achieve an enhancement in the angular-minimum critical current by a factor of 2.7, in a material that had already been process-optimised for low-temperature pinning.},
language = {en},
number = {5},
journal = {Supercond. Sci. Technol.},
author = {Strickland, Nicholas M. and Wimbush, Stuart C. and Soman, Arya Ambadiyil and Long, Nicholas J. and Rupich, Martin W. and Knibbe, Ruth and Li, Ming and Notthoff, Christian and Kluth, Patrick},
month = may,
year = {2023},
pages = {055001},
file = {Strickland et al. - 2023 - Near-isotropic enhancement of the 20 K critical cu.pdf:C\:\\Users\\scwim\\OneDrive\\Work\\Zotero Library\\Strickland et al. - 2023 - Near-isotropic enhancement of the 20 K critical cu.pdf:application/pdf},
}Downloads: 0
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Above 40 K a strong <i>c</i>-axis peak appears in the angular dependence of the critical current, as is usually expected upon the introduction of columnar defects. The critical current is enhanced significantly but only for a limited range of field angles. Close to the parallel-field direction there is no enhancement or even a reduction in critical current. Below 40 K, on the other hand, the enhancement is much broader with respect to field angle, creating an almost isotropic response at 20 K, 3 T. The absence of a prominent <i>c</i>-axis peak does not indicate a lack of pinning, since the absolute value of the critical current still increases by a factor of 2.8 compared to an unirradiated sample. Instead, we postulate that pre-existing point-like pinning centres act to mediate an interaction between the existing planar and newly-introduced columnar pins, broadening both contributions. 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