Ultra-high critical current densities, the vortex phase diagram and the effect of granularity of the stoichiometric high-Tc superconductor, CaKFe4As4
We present a comprehensive study of the critical current densities and the superconducting vortex phase diagram in the stoichiometric superconductor CaKFe4As4 which has a critical temperature of ∼35 K. We performed detailed magnetization measurements both of high quality single crystals for differen...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
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American Physical Society
2018
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| _version_ | 1797065513327656960 |
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| author | Singh, S Bristow, M Meier, W Taylor, P Blundell, S Canfield, P Coldea, A |
| author_facet | Singh, S Bristow, M Meier, W Taylor, P Blundell, S Canfield, P Coldea, A |
| author_sort | Singh, S |
| collection | OXFORD |
| description | We present a comprehensive study of the critical current densities and the superconducting vortex phase diagram in the stoichiometric superconductor CaKFe4As4 which has a critical temperature of ∼35 K. We performed detailed magnetization measurements both of high quality single crystals for different orientations in an applied magnetic field up to 16 T and for a powder sample. We find an extremely large critical current density, Jc, up to 108 A/cm2 for single crystals when H(ab) at 5 K, which remains robust in fields up to 16 T, being the largest of any other iron-based superconductor. The critical current density is reduced by a factor 10 in single crystals when Hc at 5 K and significantly suppressed by the presence of grain boundaries in the powder sample. We also observe the presence of the fishtail effect in the magnetic hysteresis loops of single crystals when Hc. The flux pinning force density and the pinning parameters suggest that the large critical current could be linked to the existence of point core and surface pinning. Based on the vortex phase diagram and the large critical current densities, CaKFe4As4 is now established as a potential iron-based superconductor candidate for practical applications. |
| first_indexed | 2024-03-06T21:29:40Z |
| format | Journal article |
| id | oxford-uuid:44407759-b6ff-43a2-a171-ff39b3d5a71b |
| institution | University of Oxford |
| last_indexed | 2024-03-06T21:29:40Z |
| publishDate | 2018 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:44407759-b6ff-43a2-a171-ff39b3d5a71b2022-03-26T15:00:33ZUltra-high critical current densities, the vortex phase diagram and the effect of granularity of the stoichiometric high-Tc superconductor, CaKFe4As4Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:44407759-b6ff-43a2-a171-ff39b3d5a71bSymplectic Elements at OxfordAmerican Physical Society2018Singh, SBristow, MMeier, WTaylor, PBlundell, SCanfield, PColdea, AWe present a comprehensive study of the critical current densities and the superconducting vortex phase diagram in the stoichiometric superconductor CaKFe4As4 which has a critical temperature of ∼35 K. We performed detailed magnetization measurements both of high quality single crystals for different orientations in an applied magnetic field up to 16 T and for a powder sample. We find an extremely large critical current density, Jc, up to 108 A/cm2 for single crystals when H(ab) at 5 K, which remains robust in fields up to 16 T, being the largest of any other iron-based superconductor. The critical current density is reduced by a factor 10 in single crystals when Hc at 5 K and significantly suppressed by the presence of grain boundaries in the powder sample. We also observe the presence of the fishtail effect in the magnetic hysteresis loops of single crystals when Hc. The flux pinning force density and the pinning parameters suggest that the large critical current could be linked to the existence of point core and surface pinning. Based on the vortex phase diagram and the large critical current densities, CaKFe4As4 is now established as a potential iron-based superconductor candidate for practical applications. |
| spellingShingle | Singh, S Bristow, M Meier, W Taylor, P Blundell, S Canfield, P Coldea, A Ultra-high critical current densities, the vortex phase diagram and the effect of granularity of the stoichiometric high-Tc superconductor, CaKFe4As4 |
| title | Ultra-high critical current densities, the vortex phase diagram and the effect of granularity of the stoichiometric high-Tc superconductor, CaKFe4As4 |
| title_full | Ultra-high critical current densities, the vortex phase diagram and the effect of granularity of the stoichiometric high-Tc superconductor, CaKFe4As4 |
| title_fullStr | Ultra-high critical current densities, the vortex phase diagram and the effect of granularity of the stoichiometric high-Tc superconductor, CaKFe4As4 |
| title_full_unstemmed | Ultra-high critical current densities, the vortex phase diagram and the effect of granularity of the stoichiometric high-Tc superconductor, CaKFe4As4 |
| title_short | Ultra-high critical current densities, the vortex phase diagram and the effect of granularity of the stoichiometric high-Tc superconductor, CaKFe4As4 |
| title_sort | ultra high critical current densities the vortex phase diagram and the effect of granularity of the stoichiometric high tc superconductor cakfe4as4 |
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