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Title: Effect of Ni doping on vortex pinning in CaK ( F e 1 x N i x ) 4 A s 4 single crystals

Abstract

We study the correlation between chemical composition and vortex dynamics in Ni-doped CaK(Fe 1–xNi x) 4As 4 (x = 0, 0.015, 0.025, 0.03, and 0.05) single crystals by performing measurements of the critical current densities J c and the flux creep rates S. The magnetic relaxation of all the crystals is well described by the collective creep theory. The samples display a glassy exponent μ within the predictions for vortex bundles in a weak pinning scenario and relatively small characteristic pinning energy ( U 0 < 100K). The undoped crystals display modest J c values at low temperatures and high magnetic fields applied along the c axis. J c( T) dependences at high fields display an unusual peak. The enhancement in J c( T) matches with an increase in U 0 and the appearance of a second peak in the magnetization. As Ni doping increases, whereas there is a monotonic decrease in T c there is a nonmonotonic change in J c. Initially J c increases, reaching a maximum value for x = 0.015, and then J c decreases for x ≥ 0.025. This change in J c( x) is coincident with the onset of antiferromagnetic order. The magnetic fieldmore » dependence of J c( H) also manifests a change in behavior between these x values. The analysis of the vortex dynamics for small and intermediate magnetic fields shows a gradual evolution in the glassy exponent μ with Ni content, x. As a result, this implies that there is no appreciable change in the mechanism that determines the vortex relaxation.« less

Authors:
ORCiD logo [1];  [2];  [2]; ORCiD logo [3];  [2];  [2]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States); Centro Atómico Bariloche and Instituto Balseiro (Argentina)
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  3. Ames Lab. and Iowa State Univ., Ames, IA (United States); Univ. de Buenos Aires, Buenos Aires (Argentina)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1561964
Alternate Identifier(s):
OSTI ID: 1559358
Report Number(s):
IS-J-10028
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
AC02-07CH11358; GBMF4411
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 6; 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

Haberkorn, N., Xu, M., Meier, W. R., Schmidt, J., Bud’ko, S. L., and Canfield, P. C. Effect of Ni doping on vortex pinning in CaK(Fe1−xNix)4As4 single crystals. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.064524.
Haberkorn, N., Xu, M., Meier, W. R., Schmidt, J., Bud’ko, S. L., & Canfield, P. C. Effect of Ni doping on vortex pinning in CaK(Fe1−xNix)4As4 single crystals. United States. doi:10.1103/PhysRevB.100.064524.
Haberkorn, N., Xu, M., Meier, W. R., Schmidt, J., Bud’ko, S. L., and Canfield, P. C. Wed . "Effect of Ni doping on vortex pinning in CaK(Fe1−xNix)4As4 single crystals". United States. doi:10.1103/PhysRevB.100.064524.
@article{osti_1561964,
title = {Effect of Ni doping on vortex pinning in CaK(Fe1−xNix)4As4 single crystals},
author = {Haberkorn, N. and Xu, M. and Meier, W. R. and Schmidt, J. and Bud’ko, S. L. and Canfield, P. C.},
abstractNote = {We study the correlation between chemical composition and vortex dynamics in Ni-doped CaK(Fe1–xNix)4As4 (x = 0, 0.015, 0.025, 0.03, and 0.05) single crystals by performing measurements of the critical current densities Jc and the flux creep rates S. The magnetic relaxation of all the crystals is well described by the collective creep theory. The samples display a glassy exponent μ within the predictions for vortex bundles in a weak pinning scenario and relatively small characteristic pinning energy (U0 < 100K). The undoped crystals display modest Jc values at low temperatures and high magnetic fields applied along the c axis. Jc(T) dependences at high fields display an unusual peak. The enhancement in Jc(T) matches with an increase in U0 and the appearance of a second peak in the magnetization. As Ni doping increases, whereas there is a monotonic decrease in Tc there is a nonmonotonic change in Jc. Initially Jc increases, reaching a maximum value for x = 0.015, and then Jc decreases for x ≥ 0.025. This change in Jc(x) is coincident with the onset of antiferromagnetic order. The magnetic field dependence of Jc(H) also manifests a change in behavior between these x values. The analysis of the vortex dynamics for small and intermediate magnetic fields shows a gradual evolution in the glassy exponent μ with Ni content, x. As a result, this implies that there is no appreciable change in the mechanism that determines the vortex relaxation.},
doi = {10.1103/PhysRevB.100.064524},
journal = {Physical Review B},
number = 6,
volume = 100,
place = {United States},
year = {2019},
month = {8}
}

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