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Title: Robust s ± pairing in CaK ( Fe 1 x Ni x ) 4 As 4 ( x = 0 and 0.05) from the response to electron irradiation

Abstract

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) 4As 4 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 is well approximated by the power-law function, Δλ(T) = AT n, with n ≈ 2.5 for x = 0 and n ≈ 1.9 for x = 0.05 in the pristine state. Detailed analysis of λ(T) and T c evolution with disorder is consistent with two effective nodeless energy gaps in the density of states due to robust s± pairing. Overall the behavior of CaK(Fe 1–xNi x) 4As 4 at x = 0 is similar to a slightly overdoped Ba 1–yK yFe 2As 2 at y ≈ 0.5, and at x = 0.05more » to an underdoped composition at y ≈ 0.2.« less

Authors:
 [1];  [1];  [2];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
  2. Univ. Paris-Saclay, Palaiseau Cedex (France)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1439421
Alternate Identifier(s):
OSTI ID: 1434993
Report Number(s):
IS-J-9672
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1900606
Grant/Contract Number:  
AC02-07CH11358; GBMF4411
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 14; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Teknowijoyo, S., Cho, K., Konczykowski, M., Timmons, E. I., Tanatar, M. A., Meier, W. R., Xu, M., Bud'ko, S. L., Canfield, P. C., and Prozorov, R. Robust s± pairing in CaK(Fe1–xNix)4As4 ( x=0 and 0.05) from the response to electron irradiation. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.97.140508.
Teknowijoyo, S., Cho, K., Konczykowski, M., Timmons, E. I., Tanatar, M. A., Meier, W. R., Xu, M., Bud'ko, S. L., Canfield, P. C., & Prozorov, R. Robust s± pairing in CaK(Fe1–xNix)4As4 ( x=0 and 0.05) from the response to electron irradiation. United States. doi:10.1103/PhysRevB.97.140508.
Teknowijoyo, S., Cho, K., Konczykowski, M., Timmons, E. I., Tanatar, M. A., Meier, W. R., Xu, M., Bud'ko, S. L., Canfield, P. C., and Prozorov, R. Fri . "Robust s± pairing in CaK(Fe1–xNix)4As4 ( x=0 and 0.05) from the response to electron irradiation". United States. doi:10.1103/PhysRevB.97.140508. https://www.osti.gov/servlets/purl/1439421.
@article{osti_1439421,
title = {Robust s± pairing in CaK(Fe1–xNix)4As4 ( x=0 and 0.05) from the response to electron irradiation},
author = {Teknowijoyo, S. and Cho, K. and Konczykowski, M. and Timmons, E. I. and Tanatar, M. A. and Meier, W. R. and Xu, M. and Bud'ko, S. L. and Canfield, P. C. and Prozorov, R.},
abstractNote = {Here, controlled pointlike disorder introduced by 2.5-MeV electron irradiation was used to probe the superconducting state of single crystals of CaK(Fe1–xNix)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, Tc, at the rate of dTc/dρ(Tc) ≈ 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 dTN/dρ(TN) ≈ 0.16 K/(μΩcm). The low-temperature variation of London penetration depth is well approximated by the power-law function, Δλ(T) = ATn, with n ≈ 2.5 for x = 0 and n ≈ 1.9 for x = 0.05 in the pristine state. Detailed analysis of λ(T) and Tc evolution with disorder is consistent with two effective nodeless energy gaps in the density of states due to robust s± pairing. Overall the behavior of CaK(Fe1–xNix)4As4 at x = 0 is similar to a slightly overdoped Ba1–yKyFe2As2 at y ≈ 0.5, and at x = 0.05 to an underdoped composition at y ≈ 0.2.},
doi = {10.1103/PhysRevB.97.140508},
journal = {Physical Review B},
issn = {2469-9950},
number = 14,
volume = 97,
place = {United States},
year = {2018},
month = {4}
}

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Cited by: 4 works
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Figures / Tables:

FIG. 1. FIG. 1.: (Color online) In-plane resistivity of stoichiometric CaKFe4As4 sample (x = 0 top panel(a)) and of sample with Ni substitution x = 0.05 (bottom panel(b)). Solid and dashed lines show resistivity of the samples before and after irradiation, with doses 2.08 C/cm2 (x = 0) and 2.38 C/cm2 (xmore » = 0.05). Red lines show the change of resistivity between irradiated and pristine states. Cyan line in the top panel is fit of the curve in pristine x = 0 sample toρ(0) +ρTT3/2. Right insets zoom on the superconducting transition range. Left inset in the bottom panel shows temperature-dependent resistivity derivative zooming on the features at TN, suppressed upon irradiation from 50.6 K to 47.5 K.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.