Tuning the Intrinsic Anisotropy with Disorder in the CaKFe4As4 Superconductor

Torsello, D.; Ummarino, G. A.; Bekaert, J.; Gozzelino, L.; Gerbaldo, R.; Tanatar, M. A.; Canfield, P. C.; Prozorov, R.; Ghigo, G.

doi:10.1103/PhysRevApplied.13.064046

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, T_c≈35 K. The London penetration depth λ_L is measured with a microwave-coplanar-resonator technique that allows us to deconvolve the anisotropic contributions λ_L,ab and λ_L,c and obtain the anisotropy parameter γλ=λ_L,c/λ_L,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:

^[1];

^[2];

^[3];

^[1]; Gerbaldo, R. ^[1];

^[4];

^[1]

Politecnico di Torino (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Torino (Italy)
Politecnico di Torino (Italy); National Research Nuclear Univ. (MEPhI), Moskva (Russia)
Univ. of Antwerp (Belgium)
Ames Lab., and Iowa State Univ., Ames, IA (United States)

Publication Date:: 2020-06-18

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; TRN: US2201589

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.  doi:10.1103/PhysRevApplied.13.064046.

Copy to clipboard


                    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

Copy to clipboard


                    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.  https://www.osti.gov/servlets/purl/1635641.

Copy to clipboard


                    
@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}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Accepted Manuscript (DOE)

Publisher's Version of Record

https://doi.org/10.1103/PhysRevApplied.13.064046

Other availability

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Works referenced in this record:

Fabrication and characterization of CaKFe ₄ As ₄ round wires sintered at high pressure
journal, November 2018

Pyon, Sunseng; Miyawaki, Daisuke; Veshchunov, Ivan
Applied Physics Express, Vol. 11, Issue 12
DOI: 10.7567/APEX.11.123101

Microwave analysis of the interplay between magnetism and superconductivity in ${EuFe}_{2} {({As}_{1 - x} P_{x})}_{2}$ single crystals
journal, November 2019

Ghigo, G.; Torsello, D.; Gozzelino, L.
Physical Review Research, Vol. 1, Issue 3
DOI: 10.1103/PhysRevResearch.1.033110

Chemical stability and superconductivity in Ag-sheathed CaKFe ₄ As ₄ superconducting tapes
journal, November 2018

Cheng, Zhe; Dong, Chiheng; Huang, He
Superconductor Science and Technology, Vol. 32, Issue 1
DOI: 10.1088/1361-6668/aaedff

Anisotropic thermodynamic and transport properties of single-crystalline ${CaKFe}_{4} {As}_{4}$
journal, August 2016

Meier, W. R.; Kong, T.; Kaluarachchi, U. S.
Physical Review B, Vol. 94, Issue 6
DOI: 10.1103/PhysRevB.94.064501

Anisotropy of the coherence length from critical currents in the stoichiometric superconductor LiFeAs
journal, November 2011

Kończykowski, M.; van der Beek, C. J.; Tanatar, M. A.
Physical Review B, Vol. 84, Issue 18
DOI: 10.1103/PhysRevB.84.180514

Enhanced critical current in superconducting FeSe _0.5 Te _0.5 films at all magnetic field orientations by scalable gold ion irradiation
journal, January 2018

Ozaki, Toshinori; Wu, Lijun; Zhang, Cheng
Superconductor Science and Technology, Vol. 31, Issue 2
DOI: 10.1088/1361-6668/aaa3c4

Effects of Swift-Particle Irradiations on Critical Current Density in CaKFe ₄ As ₄
journal, September 2019

Takahashi, A.; Pyon, S.; Okayasu, S.
Journal of Physics: Conference Series, Vol. 1293
DOI: 10.1088/1742-6596/1293/1/012013

Recent advances in iron-based superconductors toward applications
journal, April 2018

Hosono, Hideo; Yamamoto, Akiyasu; Hiramatsu, Hidenori
Materials Today, Vol. 21, Issue 3
DOI: 10.1016/j.mattod.2017.09.006

$J_{\rm c}$ Scaling and Anisotropies in Co-Doped Ba-122 Thin Films
journal, June 2011

Hanisch, Jens; Iida, Kazumasa; Haindl, Silvia
IEEE Transactions on Applied Superconductivity, Vol. 21, Issue 3
DOI: 10.1109/TASC.2010.2100348

Two-Gap Superconductivity in ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2}$ : A Complementary Study of the Magnetic Penetration Depth by Muon-Spin Rotation and Angle-Resolved Photoemission
journal, May 2009

Khasanov, R.; Evtushinsky, D. V.; Amato, A.
Physical Review Letters, Vol. 102, Issue 18
DOI: 10.1103/PhysRevLett.102.187005

Particle and Heavy Ion Transport code System, PHITS, version 2.52
journal, September 2013

Sato, Tatsuhiko; Niita, Koji; Matsuda, Norihiro
Journal of Nuclear Science and Technology, Vol. 50, Issue 9
DOI: 10.1080/00223131.2013.814553

Penetration depth of ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2}$ single crystals explained within a multiband Eliashberg $s \pm$ approach
journal, July 2017

Ghigo, G.; Ummarino, G. A.; Gozzelino, L.
Physical Review B, Vol. 96, Issue 1
DOI: 10.1103/PhysRevB.96.014501

Rapid doubling of the critical current of YBa2Cu3O7−δ coated conductors for viable high-speed industrial processing
journal, November 2015

Leroux, M.; Kihlstrom, K. J.; Holleis, S.
Applied Physics Letters, Vol. 107, Issue 19
DOI: 10.1063/1.4935335

Effect of proton irradiation on superconductivity in optimally doped ${BaFe}_{2} ({As}_{1 - x} P_{x})_{2}$ single crystals
journal, March 2016

Smylie, M. P.; Leroux, M.; Mishra, V.
Physical Review B, Vol. 93, Issue 11
DOI: 10.1103/PhysRevB.93.115119

Macroscopic anisotropy in superconductors with anisotropic gaps
journal, July 2002

Kogan, V. G.
Physical Review B, Vol. 66, Issue 2
DOI: 10.1103/PhysRevB.66.020509

Comprehensive Eliashberg analysis of microwave conductivity and penetration depth of K-, Co-, and P-substituted ${BaFe}_{2} {As}_{2}$
journal, April 2019

Torsello, D.; Ummarino, G. A.; Gozzelino, L.
Physical Review B, Vol. 99, Issue 13
DOI: 10.1103/PhysRevB.99.134518

Microwave response of superconducting pnictides: extended s _± scenario
journal, July 2009

Dolgov, O. V.; Golubov, A. A.; Parker, D.
New Journal of Physics, Vol. 11, Issue 7
DOI: 10.1088/1367-2630/11/7/075012

Anisotropy induced vortex lattice rearrangement in ${CaKFe}_{4} {As}_{4}$
journal, April 2019

Khasanov, Rustem; Meier, William R.; Bud'ko, Sergey L.
Physical Review B, Vol. 99, Issue 14
DOI: 10.1103/PhysRevB.99.140507

Effects of heavy-ion irradiation on the microwave surface impedance of (Ba _{1− x} K _x )Fe ₂ As ₂ single crystals
journal, February 2018

Ghigo, G.; Torsello, D.; Gerbaldo, R.
Superconductor Science and Technology, Vol. 31, Issue 3
DOI: 10.1088/1361-6668/aaa858

Recent developments in the ABINIT software package
journal, August 2016

Gonze, X.; Jollet, F.; Abreu Araujo, F.
Computer Physics Communications, Vol. 205
DOI: 10.1016/j.cpc.2016.04.003

Screening of pair fluctuations in superconductors with coupled shallow and deep bands: A route to higher-temperature superconductivity
journal, August 2019

Salasnich, L.; Shanenko, A. A.; Vagov, A.
Physical Review B, Vol. 100, Issue 6
DOI: 10.1103/PhysRevB.100.064510

Anisotropy of the iron pnictide superconductor $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$ $(x = 0.074, T_{c} = 23 K)$
journal, March 2009

Tanatar, M. A.; Ni, N.; Martin, C.
Physical Review B, Vol. 79, Issue 9
DOI: 10.1103/PhysRevB.79.094507

Predictions of Multiband s± Strong-Coupling Eliashberg Theory Compared to Experimental Data in Iron Pnictides
journal, October 2010

Ummarino, G. A.; Daghero, D.; Tortello, M.
Journal of Superconductivity and Novel Magnetism, Vol. 24, Issue 1-2
DOI: 10.1007/s10948-010-1006-3

Eliashberg Analysis of the Electrodynamic Response of Ba(Fe1−xRhx)2As2 Across the s± to s++ Order Parameter Transition
journal, December 2019

Torsello, Daniele; Ummarino, Giovanni Alberto; Gerbaldo, Roberto
Journal of Superconductivity and Novel Magnetism
DOI: 10.1007/s10948-019-05368-2

Enhancement of critical current densities in (Ba,K)Fe ₂ As ₂ wires and tapes using HIP technique
journal, September 2016

Pyon, Sunseng; Suwa, Takahiro; Park, Akiyoshi
Superconductor Science and Technology, Vol. 29, Issue 11
DOI: 10.1088/0953-2048/29/11/115002

Temperature-Dependent Anisotropy of the Penetration Depth and Coherence Length of ${MgB}_{2}$
journal, August 2005

Fletcher, J. D.; Carrington, A.; Taylor, O. J.
Physical Review Letters, Vol. 95, Issue 9
DOI: 10.1103/PhysRevLett.95.097005

Effect of two bands on the scaling of critical current density in ${MgB}_{2}$ thin films
journal, June 2004

Choi, Eun Mi; Kim, Heon-Jung; Gupta, S. K.
Physical Review B, Vol. 69, Issue 22
DOI: 10.1103/PhysRevB.69.224510

Effects of disorder induced by heavy-ion irradiation on (Ba1−x K x )Fe2As2 single crystals, within the three-band Eliashberg s± wave model
journal, October 2017

Ghigo, G.; Ummarino, G. A.; Gozzelino, L.
Scientific Reports, Vol. 7, Issue 1
DOI: 10.1038/s41598-017-13303-5

High-field transport properties of a P-doped BaFe2As2 film on technical substrate
journal, January 2017

Iida, Kazumasa; Sato, Hikaru; Tarantini, Chiara
Scientific Reports, Vol. 7, Issue 1
DOI: 10.1038/srep39951

SRIM – The stopping and range of ions in matter (2010)
journal, June 2010

Ziegler, James F.; Ziegler, M. D.; Biersack, J. P.
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 268, Issue 11-12
DOI: 10.1016/j.nimb.2010.02.091

Intrinsic pinning and the critical current scaling of clean epitaxial Fe(Se,Te) thin films
journal, March 2013

Iida, Kazumasa; Hänisch, Jens; Reich, Elke
Physical Review B, Vol. 87, Issue 10
DOI: 10.1103/PhysRevB.87.104510

Engineered Pinning Landscapes for Enhanced 2G Coil Wire
journal, April 2016

Rupich, Martin W.; Sathyamurthy, Srivatsan; Fleshler, Steven
IEEE Transactions on Applied Superconductivity, Vol. 26, Issue 3
DOI: 10.1109/TASC.2016.2542270

Anisotropy of strong pinning in multi-band superconductors
journal, July 2012

van der Beek, C. J.; Konczykowski, M.; Prozorov, R.
Superconductor Science and Technology, Vol. 25, Issue 8
DOI: 10.1088/0953-2048/25/8/084010

New Fe-based superconductors: properties relevant for applications
journal, February 2010

Putti, M.; Pallecchi, I.; Bellingeri, E.
Superconductor Science and Technology, Vol. 23, Issue 3
DOI: 10.1088/0953-2048/23/3/034003

Intrinsic and extrinsic pinning in NdFeAs(O,F): vortex trapping and lock-in by the layered structure
journal, October 2016

Tarantini, C.; Iida, K.; Hänisch, J.
Scientific Reports, Vol. 6, Issue 1
DOI: 10.1038/srep36047

Temperature-dependent anisotropies of upper critical field and London penetration depth
journal, July 2019

Kogan, V. G.; Prozorov, R.; Koshelev, A. E.
Physical Review B, Vol. 100, Issue 1
DOI: 10.1103/PhysRevB.100.014518

Effects of core density and impurities on the critical current density of CaKFe ₄ As ₄ superconducting tapes
journal, September 2019

Cheng, Zhe; Liu, Shifa; Dong, Chiheng
Superconductor Science and Technology, Vol. 32, Issue 10
DOI: 10.1088/1361-6668/ab3a87

From isotropic to anisotropic superconductors: A scaling approach
journal, February 1992

Blatter, G.; Geshkenbein, V. B.; Larkin, A. I.
Physical Review Letters, Vol. 68, Issue 6
DOI: 10.1103/PhysRevLett.68.875

Enhancement of the Superconducting Gap by Nesting in ${CaKFe}_{4} {As}_{4}$ : A New High Temperature Superconductor
journal, December 2016

Mou, Daixiang; Kong, Tai; Meier, William R.
Physical Review Letters, Vol. 117, Issue 27
DOI: 10.1103/PhysRevLett.117.277001

Enhancement of critical current density in CaKFe ₄ As ₄ single crystals through 3 MeV proton irradiation
journal, January 2020

Haberkorn, N.; Xu, M.; Meier, W. R.
Superconductor Science and Technology, Vol. 33, Issue 2
DOI: 10.1088/1361-6668/ab5f4b

Analysis of the London penetration depth in Ni-doped ${CaKFe}_{4} {As}_{4}$
journal, September 2019

Torsello, D.; Cho, K.; Joshi, K. R.
Physical Review B, Vol. 100, Issue 9
DOI: 10.1103/PhysRevB.100.094513

Disorder-Driven Transition from $s_{\pm}$ to $s_{+ +}$ Superconducting Order Parameter in Proton Irradiated $Ba ({Fe}_{1 - x} {Rh}_{x})_{2} {As}_{2}$ Single Crystals
journal, September 2018

Ghigo, G.; Torsello, D.; Ummarino, G. A.
Physical Review Letters, Vol. 121, Issue 10
DOI: 10.1103/PhysRevLett.121.107001

Similar Records in DOE PAGES and OSTI.GOV collections:

Anisotropy induced vortex lattice rearrangement in ${CaKFe}_{4} {As}_{4}$

Journal Article Khasanov, Rustem ; Meier, William R. ; Bud'ko, Sergey L. ; ... - Physical Review B

Tmore »« less
Cited by 3
https://doi.org/10.1103/PhysRevB.99.140507

Full Text Available
Robust $s_{\pm}$ pairing in $CaK {({Fe}_{1 - x} {Ni}_{x})}_{4} {As}_{4}$ ( $x = 0$ and 0.05) from the response to electron irradiation

Journal Article Teknowijoyo, S. ; Cho, K. ; Konczykowski, M. ; ... - Physical Review B

Here, controlled pointlike disorder introduced by 2.5-MeV electron irradiation was used to probe the superconducting state of single crystals of CaK(Fe_1–xNi_x)₄As₄ superconductor at x = 0 and 0.05 doping levels. Both compositions show an increase of the residual resistivity and a decrease of the superconducting transition temperature, T_c, at the rate of dT_c/dρ(T_c) ≈ 0.19 K/(μΩcm) for x = 0 and 0.38 K/(μΩcm) for x = 0.05, respectively. In the Ni-doped compound (x = 0.05), the coexisting spin-vortex crystal (SVC) magnetic phase is suppressed at the rate of dT_N/dρ(T_N) ≈ 0.16 K/(μΩcm). The low-temperature variation of London penetration depth ismore »« less
Cited by 4
https://doi.org/10.1103/PhysRevB.97.140508

Full Text Available
Effect of heavy-ion irradiation on London penetration depth in overdoped Ba(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$

Journal Article Murphy, J. ; Tanatar, M. A. ; Kim, Hyunsoo ; ... - Physical Review. B, Condensed Matter and Materials Physics

Irradiation with 1.4 GeV ²⁰⁸ Pb ions was used to induce artificial disorder in single crystals of iron-arsenide superconductor Ba(Fe _{1 - x} Co _x ) ₂ As ₂ and to study its effects on the temperature-dependent London penetration depth and transport properties. A study was undertaken on overdoped single crystals with x = 0.108 and x = 0.127 characterized by notable modulation of the superconducting gap. Irradiation corresponding to the matching fields of B _Φ = 6 T and 6.5 T with doses 2.22 × 10 ¹¹ d /cm ² and 2.4 × 10 ¹¹ d /cm 2 ,more »« less
https://doi.org/10.1103/PhysRevB.88.054514
Nodeless multiband superconductivity in stoichiometric single-crystalline ${CaKFe}_{4} {As}_{4}$

Journal Article Cho, Kyuil ; Fente, A. ; Teknowijoyo, S. ; ... - Physical Review B

Measurements of the London penetration depth Δλ(T) and tunneling conductance in single crystals of the recently discovered stoichiometric iron-based superconductor CaKFe₄As₄ (CaK1144) show nodeless, two-effective-gap superconductivity with a larger gap of about 6–10 meV and a smaller gap of about 1–4 meV. Having a critical temperature T_c,onset ≈ 35.8 K, this material behaves similar to slightly overdoped (Ba_1–xK_x)Fe₂As₂ (e.g., x = 0.54,T_c ≈ 34 K), a known multigap s_± superconductor. Here, we conclude that the superconducting behavior of stoichiometric CaK1144 demonstrates that two-gap s± superconductivity is an essential property of high-temperature superconductivity in iron-based superconductors, independent of the degree ofmore » substitutional disorder.« less
Cited by 9
https://doi.org/10.1103/PhysRevB.95.100502

Full Text Available
Disorder-Driven Transition from $s_{\pm}$ to $s_{+ +}$ Superconducting Order Parameter in Proton Irradiated $Ba ({Fe}_{1 - x} {Rh}_{x})_{2} {As}_{2}$ Single Crystals

Journal Article Ghigo, Gianluca ; Torsello, D. ; Ummarino, G. A. ; ... - Physical Review Letters

Here, microwave measurements of the London penetration depth and critical temperature T_c were used to show evidence of a disordered-driven transition from s_± to s₊₊ order parameter symmetry in optimally doped Ba(Fe_1–xRh_x)₂As₂ single crystals, where disorder was induced by means of 3.5 MeV proton irradiation. Signatures of such a transition, as theoretically predicted, are found as a drop in the low-temperature values of the London penetration depth and a virtually disorder-independent superconducting T_c. We show how these experimental observations can be described by multiband Eliashberg calculations in which the effect of disorder is accounted for in a suitable way. Tomore »« less
Cited by 3
https://doi.org/10.1103/PhysRevLett.121.107001

Full Text Available

Similar Records

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

Abstract

Citation Formats

Fabrication and characterization of CaKFe 4 As 4 round wires sintered at high pressure journal, November 2018

Microwave analysis of the interplay between magnetism and superconductivity in EuFe 2 ( As 1 − x P x ) 2 single crystals journal, November 2019

Chemical stability and superconductivity in Ag-sheathed CaKFe 4 As 4 superconducting tapes journal, November 2018

Anisotropic thermodynamic and transport properties of single-crystalline CaKFe 4 As 4 journal, August 2016

Anisotropy of the coherence length from critical currents in the stoichiometric superconductor LiFeAs journal, November 2011

Enhanced critical current in superconducting FeSe 0.5 Te 0.5 films at all magnetic field orientations by scalable gold ion irradiation journal, January 2018

Effects of Swift-Particle Irradiations on Critical Current Density in CaKFe 4 As 4 journal, September 2019

Recent advances in iron-based superconductors toward applications journal, April 2018

$J_{\rm c}$ Scaling and Anisotropies in Co-Doped Ba-122 Thin Films journal, June 2011

Two-Gap Superconductivity in Ba 1 − x K x Fe 2 As 2 : A Complementary Study of the Magnetic Penetration Depth by Muon-Spin Rotation and Angle-Resolved Photoemission journal, May 2009

Particle and Heavy Ion Transport code System, PHITS, version 2.52 journal, September 2013

Penetration depth of Ba 1 − x K x Fe 2 As 2 single crystals explained within a multiband Eliashberg s ± approach journal, July 2017

Rapid doubling of the critical current of YBa2Cu3O7−δ coated conductors for viable high-speed industrial processing journal, November 2015

Effect of proton irradiation on superconductivity in optimally doped BaFe 2 ( As 1 − x P x ) 2 single crystals journal, March 2016

Macroscopic anisotropy in superconductors with anisotropic gaps journal, July 2002

Comprehensive Eliashberg analysis of microwave conductivity and penetration depth of K-, Co-, and P-substituted BaFe 2 As 2 journal, April 2019

Microwave response of superconducting pnictides: extended s ± scenario journal, July 2009

Anisotropy induced vortex lattice rearrangement in CaKFe 4 As 4 journal, April 2019

Effects of heavy-ion irradiation on the microwave surface impedance of (Ba 1− x K x )Fe 2 As 2 single crystals journal, February 2018

Recent developments in the ABINIT software package journal, August 2016

Screening of pair fluctuations in superconductors with coupled shallow and deep bands: A route to higher-temperature superconductivity journal, August 2019

Anisotropy of the iron pnictide superconductor Ba ( Fe 1 − x Co x ) 2 As 2 ( x = 0.074 , T c = 23 K ) journal, March 2009

Predictions of Multiband s± Strong-Coupling Eliashberg Theory Compared to Experimental Data in Iron Pnictides journal, October 2010

Eliashberg Analysis of the Electrodynamic Response of Ba(Fe1−xRhx)2As2 Across the s± to s++ Order Parameter Transition journal, December 2019

Enhancement of critical current densities in (Ba,K)Fe 2 As 2 wires and tapes using HIP technique journal, September 2016

Temperature-Dependent Anisotropy of the Penetration Depth and Coherence Length of MgB 2 journal, August 2005

Effect of two bands on the scaling of critical current density in MgB 2 thin films journal, June 2004

Effects of disorder induced by heavy-ion irradiation on (Ba1−x K x )Fe2As2 single crystals, within the three-band Eliashberg s± wave model journal, October 2017

High-field transport properties of a P-doped BaFe2As2 film on technical substrate journal, January 2017

SRIM – The stopping and range of ions in matter (2010) journal, June 2010

Intrinsic pinning and the critical current scaling of clean epitaxial Fe(Se,Te) thin films journal, March 2013

Engineered Pinning Landscapes for Enhanced 2G Coil Wire journal, April 2016

Anisotropy of strong pinning in multi-band superconductors journal, July 2012

New Fe-based superconductors: properties relevant for applications journal, February 2010

Intrinsic and extrinsic pinning in NdFeAs(O,F): vortex trapping and lock-in by the layered structure journal, October 2016

Temperature-dependent anisotropies of upper critical field and London penetration depth journal, July 2019

Effects of core density and impurities on the critical current density of CaKFe 4 As 4 superconducting tapes journal, September 2019

From isotropic to anisotropic superconductors: A scaling approach journal, February 1992

Enhancement of the Superconducting Gap by Nesting in CaKFe 4 As 4 : A New High Temperature Superconductor journal, December 2016

Enhancement of critical current density in CaKFe 4 As 4 single crystals through 3 MeV proton irradiation journal, January 2020

Analysis of the London penetration depth in Ni-doped CaKFe 4 As 4 journal, September 2019

Disorder-Driven Transition from s ± to s + + Superconducting Order Parameter in Proton Irradiated Ba ( Fe 1 − x Rh x ) 2 As 2 Single Crystals journal, September 2018

Title: Tuning the Intrinsic Anisotropy with Disorder in the ${Ca K Fe}_{4} {As}_{4}$ Superconductor

Fabrication and characterization of CaKFe ₄ As ₄ round wires sintered at high pressure
journal, November 2018

Microwave analysis of the interplay between magnetism and superconductivity in ${EuFe}_{2} {({As}_{1 - x} P_{x})}_{2}$ single crystals
journal, November 2019

Chemical stability and superconductivity in Ag-sheathed CaKFe ₄ As ₄ superconducting tapes
journal, November 2018

Anisotropic thermodynamic and transport properties of single-crystalline ${CaKFe}_{4} {As}_{4}$
journal, August 2016

Anisotropy of the coherence length from critical currents in the stoichiometric superconductor LiFeAs
journal, November 2011

Enhanced critical current in superconducting FeSe _0.5 Te _0.5 films at all magnetic field orientations by scalable gold ion irradiation
journal, January 2018

Effects of Swift-Particle Irradiations on Critical Current Density in CaKFe ₄ As ₄
journal, September 2019

Recent advances in iron-based superconductors toward applications
journal, April 2018

$J_{\rm c}$ Scaling and Anisotropies in Co-Doped Ba-122 Thin Films
journal, June 2011

Two-Gap Superconductivity in ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2}$ : A Complementary Study of the Magnetic Penetration Depth by Muon-Spin Rotation and Angle-Resolved Photoemission
journal, May 2009

Particle and Heavy Ion Transport code System, PHITS, version 2.52
journal, September 2013

Penetration depth of ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2}$ single crystals explained within a multiband Eliashberg $s \pm$ approach
journal, July 2017

Rapid doubling of the critical current of YBa2Cu3O7−δ coated conductors for viable high-speed industrial processing
journal, November 2015

Effect of proton irradiation on superconductivity in optimally doped ${BaFe}_{2} ({As}_{1 - x} P_{x})_{2}$ single crystals
journal, March 2016

Macroscopic anisotropy in superconductors with anisotropic gaps
journal, July 2002

Comprehensive Eliashberg analysis of microwave conductivity and penetration depth of K-, Co-, and P-substituted ${BaFe}_{2} {As}_{2}$
journal, April 2019

Microwave response of superconducting pnictides: extended s _± scenario
journal, July 2009

Anisotropy induced vortex lattice rearrangement in ${CaKFe}_{4} {As}_{4}$
journal, April 2019

Effects of heavy-ion irradiation on the microwave surface impedance of (Ba _{1− x} K _x )Fe ₂ As ₂ single crystals
journal, February 2018

Recent developments in the ABINIT software package
journal, August 2016

Screening of pair fluctuations in superconductors with coupled shallow and deep bands: A route to higher-temperature superconductivity
journal, August 2019

Anisotropy of the iron pnictide superconductor $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$ $(x = 0.074, T_{c} = 23 K)$
journal, March 2009

Predictions of Multiband s± Strong-Coupling Eliashberg Theory Compared to Experimental Data in Iron Pnictides
journal, October 2010

Eliashberg Analysis of the Electrodynamic Response of Ba(Fe1−xRhx)2As2 Across the s± to s++ Order Parameter Transition
journal, December 2019

Enhancement of critical current densities in (Ba,K)Fe ₂ As ₂ wires and tapes using HIP technique
journal, September 2016

Temperature-Dependent Anisotropy of the Penetration Depth and Coherence Length of ${MgB}_{2}$
journal, August 2005

Effect of two bands on the scaling of critical current density in ${MgB}_{2}$ thin films
journal, June 2004

Effects of disorder induced by heavy-ion irradiation on (Ba1−x K x )Fe2As2 single crystals, within the three-band Eliashberg s± wave model
journal, October 2017

High-field transport properties of a P-doped BaFe2As2 film on technical substrate
journal, January 2017

SRIM – The stopping and range of ions in matter (2010)
journal, June 2010

Intrinsic pinning and the critical current scaling of clean epitaxial Fe(Se,Te) thin films
journal, March 2013

Engineered Pinning Landscapes for Enhanced 2G Coil Wire
journal, April 2016

Anisotropy of strong pinning in multi-band superconductors
journal, July 2012

New Fe-based superconductors: properties relevant for applications
journal, February 2010

Intrinsic and extrinsic pinning in NdFeAs(O,F): vortex trapping and lock-in by the layered structure
journal, October 2016

Temperature-dependent anisotropies of upper critical field and London penetration depth
journal, July 2019

Effects of core density and impurities on the critical current density of CaKFe ₄ As ₄ superconducting tapes
journal, September 2019

From isotropic to anisotropic superconductors: A scaling approach
journal, February 1992

Enhancement of the Superconducting Gap by Nesting in ${CaKFe}_{4} {As}_{4}$ : A New High Temperature Superconductor
journal, December 2016

Enhancement of critical current density in CaKFe ₄ As ₄ single crystals through 3 MeV proton irradiation
journal, January 2020

Analysis of the London penetration depth in Ni-doped ${CaKFe}_{4} {As}_{4}$
journal, September 2019

Disorder-Driven Transition from $s_{\pm}$ to $s_{+ +}$ Superconducting Order Parameter in Proton Irradiated $Ba ({Fe}_{1 - x} {Rh}_{x})_{2} {As}_{2}$ Single Crystals
journal, September 2018