skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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
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.
@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},
number = 14,
volume = 97,
place = {United States},
year = {Fri Apr 27 00:00:00 EDT 2018},
month = {Fri Apr 27 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on April 27, 2019
Publisher's Version of Record

Save / Share: