Ultrahigh critical current densities, the vortex phase diagram, and the effect of granularity of the stoichiometric high-Tc superconductor CaKFe4As4

Singh, Shiv J.; Bristow, Matthew; Meier, William R.; Taylor, Patrick; Blundell, Stephen J.; Canfield, Paul C.; Coldea, Amalia I.

doi:10.1103/PhysRevMaterials.2.074802

Title: Ultrahigh critical current densities, the vortex phase diagram, and the effect of granularity of the stoichiometric high-T_c superconductor CaKFe₄As₄

Journal Article · 30 July 2018 · Physical Review Materials

DOI: https://doi.org/10.1103/PhysRevMaterials.2.074802 · OSTI ID:1556119

Singh, Shiv J. ^[1]; Bristow, Matthew ^[1]; Meier, William R. ^[2]; Taylor, Patrick ^[1]; Blundell, Stephen J. ^[1]; Canfield, Paul C. ^[2]; Coldea, Amalia I. ^[1]

Univ. of Oxford (United Kingdom)
Ames Lab. and Iowa State Univ., Ames, IA (United States)

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, J_c, 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 H∥c 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 H∥c. 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.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1556119

Report Number(s):: is--j 9731

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 7 Vol. 2; ISSN PRMHAR; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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