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Title: Ultrahigh critical current densities, the vortex phase diagram, and the effect of granularity of the stoichiometric high-T c superconductor CaKFe 4As 4

Abstract

We present a comprehensive study of the critical current densities and the superconducting vortex phase diagram in the stoichiometric superconductor CaKFe 4As 4 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 10 8 A/cm 2 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, CaKFe 4As 4 is now established as a potential iron-based superconductormore » candidate for practical applications.« less

Authors:
 [1];  [1];  [2];  [1];  [1];  [2];  [1]
  1. Univ. of Oxford (United Kingdom)
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1556119
Alternate Identifier(s):
OSTI ID: 1462138
Report Number(s):
is-j 9731
Journal ID: ISSN 2475-9953; PRMHAR
Grant/Contract Number:  
AC02-07CH11358; GBMF4411; EP/I004475/1
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 2; Journal Issue: 7; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Singh, Shiv J., Bristow, Matthew, Meier, William R., Taylor, Patrick, Blundell, Stephen J., Canfield, Paul C., and Coldea, Amalia I. Ultrahigh critical current densities, the vortex phase diagram, and the effect of granularity of the stoichiometric high-Tc superconductor CaKFe4As4. United States: N. p., 2018. Web. doi:10.1103/PhysRevMaterials.2.074802.
Singh, Shiv J., Bristow, Matthew, Meier, William R., Taylor, Patrick, Blundell, Stephen J., Canfield, Paul C., & Coldea, Amalia I. Ultrahigh critical current densities, the vortex phase diagram, and the effect of granularity of the stoichiometric high-Tc superconductor CaKFe4As4. United States. doi:10.1103/PhysRevMaterials.2.074802.
Singh, Shiv J., Bristow, Matthew, Meier, William R., Taylor, Patrick, Blundell, Stephen J., Canfield, Paul C., and Coldea, Amalia I. Mon . "Ultrahigh critical current densities, the vortex phase diagram, and the effect of granularity of the stoichiometric high-Tc superconductor CaKFe4As4". United States. doi:10.1103/PhysRevMaterials.2.074802. https://www.osti.gov/servlets/purl/1556119.
@article{osti_1556119,
title = {Ultrahigh critical current densities, the vortex phase diagram, and the effect of granularity of the stoichiometric high-Tc superconductor CaKFe4As4},
author = {Singh, Shiv J. and Bristow, Matthew and Meier, William R. and Taylor, Patrick and Blundell, Stephen J. and Canfield, Paul C. and Coldea, Amalia I.},
abstractNote = {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 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.},
doi = {10.1103/PhysRevMaterials.2.074802},
journal = {Physical Review Materials},
number = 7,
volume = 2,
place = {United States},
year = {2018},
month = {7}
}

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