Effect of Ni doping on vortex pinning in CaK(Fe1-xNix)4As4 single crystals

Haberkorn, N.; Xu, M.; Meier, W. R.; Schmidt, J.; Bud’ko, S. L.; Canfield, P. C.

doi:10.1103/PhysRevB.100.064524

Title: Effect of Ni doping on vortex pinning in $CaK {(F e_{1 - x} N i_{x})}_{4} A s_{4}$ single crystals

Journal Article · Wed Aug 28 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.100.064524· OSTI ID:1561964

^[1]; Xu, M. ^[2]; Meier, W. R. ^[2];

^[3]; Bud’ko, S. L. ^[2]; Canfield, P. C. ^[2]

Ames Lab. and Iowa State Univ., Ames, IA (United States); Centro Atómico Bariloche and Instituto Balseiro (Argentina)
Ames Lab. and Iowa State Univ., Ames, IA (United States)
Ames Lab. and Iowa State Univ., Ames, IA (United States); Univ. de Buenos Aires, Buenos Aires (Argentina)

We study the correlation between chemical composition and vortex dynamics in Ni-doped CaK(Fe_1–xNi_x)₄As₄ (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 (U₀ < 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 U₀ 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 field 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.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358; GBMF4411

OSTI ID:: 1561964

Alternate ID(s):: OSTI ID: 1559358

Report Number(s):: IS-J-10028; PRBMDO; TRN: US2000672

Journal Information:: Physical Review B, Vol. 100, Issue 6; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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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