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Title: Tuning the Intrinsic Anisotropy with Disorder in the Ca K Fe 4 As 4 Superconductor

Abstract

In this paper, we report on the anisotropy of the London penetration depth of CaKFe4As4, discussing how it relates to its electronic structure and how it modifies under introduction of disorder, both chemically induced (by Ni substitution) and irradiation induced (by 3.5-MeV protons). Indeed, CaKFe4As4 is particularly suitable for the study of fundamental superconducting properties due to its stoichiometric composition, exhibiting clean-limit behavior in the pristine samples and having a fairly high critical temperature, Tc≈35 K. The London penetration depth λL is measured with a microwave-coplanar-resonator technique that allows us to deconvolve the anisotropic contributions λL,ab and λL,c and obtain the anisotropy parameter γλ=λL,cL,ab. The γλ(T) found for the undoped pristine sample is in good agreement with previous literature and is here compared to ab initio density-functional-theory and Eliashberg calculations. The dependence of γλ(T) on both chemical and irradiation-induced disorder is discussed to highlight which method is more suitable to decrease the direction dependence of the electromagnetic properties while maintaining a high critical temperature. Lastly, the relevance of an intrinsic anisotropy such as γλ on application-related anisotropic parameters (critical current, pinning) is discussed in light of the recent employment of CaKFe4As4 in the production of wires.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1];  [1]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [1]
  1. Politecnico di Torino (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Torino (Italy)
  2. Politecnico di Torino (Italy); National Research Nuclear Univ. (MEPhI), Moskva (Russia)
  3. Univ. of Antwerp (Belgium)
  4. Ames Lab., and Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Italian Ministry of Education, University and Research; MEPhI Academic Excellence Project
OSTI Identifier:
1635641
Report Number(s):
IS-J-10,255
Journal ID: ISSN 2331-7019; PRAHB2
Grant/Contract Number:  
201785KWLE; AC02-07CH11358; 702.a03.21.0005
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Applied
Additional Journal Information:
Journal Volume: 13; Journal Issue: 6; Journal ID: ISSN 2331-7019
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Energy research; materials science; superconductivity; impurities in superconductors; multiband superconductivity; penetration depth; disordered systems; iron-based superconductors; density functional theory; Eliashberg theory; sample preparation

Citation Formats

Torsello, D., Ummarino, G. A., Bekaert, J., Gozzelino, L., Gerbaldo, R., Tanatar, M. A., Canfield, P. C., Prozorov, R., and Ghigo, G. Tuning the Intrinsic Anisotropy with Disorder in the CaKFe4As4 Superconductor. United States: N. p., 2020. Web. https://doi.org/10.1103/PhysRevApplied.13.064046.
Torsello, D., Ummarino, G. A., Bekaert, J., Gozzelino, L., Gerbaldo, R., Tanatar, M. A., Canfield, P. C., Prozorov, R., & Ghigo, G. Tuning the Intrinsic Anisotropy with Disorder in the CaKFe4As4 Superconductor. United States. https://doi.org/10.1103/PhysRevApplied.13.064046
Torsello, D., Ummarino, G. A., Bekaert, J., Gozzelino, L., Gerbaldo, R., Tanatar, M. A., Canfield, P. C., Prozorov, R., and Ghigo, G. Thu . "Tuning the Intrinsic Anisotropy with Disorder in the CaKFe4As4 Superconductor". United States. https://doi.org/10.1103/PhysRevApplied.13.064046.
@article{osti_1635641,
title = {Tuning the Intrinsic Anisotropy with Disorder in the CaKFe4As4 Superconductor},
author = {Torsello, D. and Ummarino, G. A. and Bekaert, J. and Gozzelino, L. and Gerbaldo, R. and Tanatar, M. A. and Canfield, P. C. and Prozorov, R. and Ghigo, G.},
abstractNote = {In this paper, we report on the anisotropy of the London penetration depth of CaKFe4As4, discussing how it relates to its electronic structure and how it modifies under introduction of disorder, both chemically induced (by Ni substitution) and irradiation induced (by 3.5-MeV protons). Indeed, CaKFe4As4 is particularly suitable for the study of fundamental superconducting properties due to its stoichiometric composition, exhibiting clean-limit behavior in the pristine samples and having a fairly high critical temperature, Tc≈35 K. The London penetration depth λL is measured with a microwave-coplanar-resonator technique that allows us to deconvolve the anisotropic contributions λL,ab and λL,c and obtain the anisotropy parameter γλ=λL,c/λL,ab. The γλ(T) found for the undoped pristine sample is in good agreement with previous literature and is here compared to ab initio density-functional-theory and Eliashberg calculations. The dependence of γλ(T) on both chemical and irradiation-induced disorder is discussed to highlight which method is more suitable to decrease the direction dependence of the electromagnetic properties while maintaining a high critical temperature. Lastly, the relevance of an intrinsic anisotropy such as γλ on application-related anisotropic parameters (critical current, pinning) is discussed in light of the recent employment of CaKFe4As4 in the production of wires.},
doi = {10.1103/PhysRevApplied.13.064046},
journal = {Physical Review Applied},
number = 6,
volume = 13,
place = {United States},
year = {2020},
month = {6}
}

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