Title: Chemical stability and superconductivity in Ag-sheathed CaKFe4As4 superconducting tapes

Journal Article · · Superconductor Science and Technology
ORCiD logo [1];  [2]; ORCiD logo [1];  [1];  [1]; ORCiD logo [2];  [3];  [3];  [3]; ORCiD logo [1]
  1. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Science, Beijing (People's Republic of China)
  2. Chinese Academy of Sciences (CAS), Beijing (China)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
+ Show Author Affiliations

Ag-sheathed CaKFe4As4 superconducting tapes have been fabricated via the ex situ powder-in-tube method. X-ray diffraction analyses suggest that the CaKFe4As4 phase reacts strongly with the silver sheath at temperature above 500 °C. We therefore anneal the tape at 500 °C and obtain a transport critical current density J c(4.2 K, 0 T) ~ 2.7 × 104 A cm–2. The pinning potential derived from magnetoresistance measurements is one order of magnitude lower than that of the (Ba/Sr)1–xKxFe2As2 tapes. Combining with the scanning electron microscopy and magneto-optical imaging results, we suggest that bad connectivity between superconducting grains caused by the low sintering temperature is the main factor responsible for the low J c. Furthermore, this system is still a promising candidate for superconducting wires and tapes if we find a compatible sheath material and further optimize the post-annealing process to achieve better grain connectivity.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
Chinese Academy of Sciences (CAS); National Natural Science Foundation of China; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1503251
Journal Information:
Superconductor Science and Technology, Journal Name: Superconductor Science and Technology Journal Issue: 1 Vol. 32; ISSN 0953-2048
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

References (28)

Topotactical reactions with ferrimagnetic oxides having hexagonal crystal structures—I journal February 1959
Recent advances in iron-based superconductors toward applications journal April 2018
High critical current density in textured Ba-122/Ag tapes fabricated by a scalable rolling process journal April 2015
Calorimetric evidence for enhancement of homogeneity in high performance Sr 1-x K x Fe 2 As 2 superconductors journal September 2017
Iron-Based Layered Superconductor La[O 1- x F x ]FeAs ( x = 0.05−0.12) with T c = 26 K journal March 2008
New-Structure-Type Fe-Based Superconductors: Ca A Fe 4 As 4 ( A = K, Rb, Cs) and Sr A Fe 4 As 4 ( A = Rb, Cs) journal March 2016
To use or not to use cool superconductors? journal March 2011
High intergrain critical current density in fine-grain (Ba0.6K0.4)Fe2As2 wires and bulks journal May 2012
Hot pressing to enhance the transport Jc of Sr0.6K0.4Fe2As2 superconducting tapes journal November 2014
Effects of introducing isotropic artificial defects on the superconducting properties of differently doped Ba-122 based single crystals journal June 2016
Realization of practical level current densities in Sr 0.6 K 0.4 Fe 2 As 2 tape conductors for high-field applications journal May 2014
Vortex pinning and dynamics in high performance Sr 0.6 K 0.4 Fe 2 As 2 superconductor journal April 2016
Enhancement of critical current densities in (Ba,K)Fe 2 As 2 wires and tapes using HIP technique journal September 2016
Very strong intrinsic flux pinning and vortex avalanches in ( Ba , K ) Fe 2 As 2 superconducting single crystals journal July 2010
Upper critical field of high-quality single crystals of KFe 2 As 2 journal April 2013
Anisotropic thermodynamic and transport properties of single-crystalline CaKFe 4 As 4 journal August 2016
Nodeless multiband superconductivity in stoichiometric single-crystalline CaKFe 4 As 4 journal March 2017
Stability of the 1144 phase in iron pnictides journal March 2018
Direct Observation of Local Potassium Variation and Its Correlation to Electronic Inhomogeneity in ( Ba 1 − x K x ) Fe 2 As 2 Pnictide journal June 2011
Optimization of the crystal growth of the superconductor CaKFe 4 As 4 from solution in the FeAs − CaFe 2 As 2 − KFe 2 As 2 system journal June 2017
Ultrahigh critical current densities, the vortex phase diagram, and the effect of granularity of the stoichiometric high- T c superconductor CaKFe 4 As 4 journal July 2018
Superconducting Properties of PIT $\text{BaFe}_{2-x}\text{Co}_{x}\text{As}_{2}$ Tapes journal June 2017
Superconducting Properties of 100-m Class Sr0.6K0.4Fe2As2 Tape and Pancake Coils journal June 2017
Influences of Tape Thickness on the Properties of Ag-Sheathed Sr 1-x K x Fe 2 As 2 Superconducting Tapes journal June 2018
Effect of Wire Diameter on the Microstructure and $J_{{\text{c}}}$ Properties of Ba 0.6 K 0.4 Fe 2 As 2 Tapes journal June 2018
Critical Current Density and Flux Pinning Mechanism in Flat-Rolled Sr-122/Ag Tapes journal December 2018
Vortex pinning and dynamics in high performance Sr0.6K0.4Fe2As2 superconductor text January 2016
Recent advances in iron-based superconductors toward applications text January 2017

Similar Records

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
critical current density
iron-based superconducting tapes
powder-in-tube