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Title: Antiferromagnetic order in CaK ( Fe 1 x Ni x ) 4 As 4 and its interplay with superconductivity

Journal Article · · Physical Review B

The magnetic order in CaK(Fe1-xNix)4As4 (1144) single crystals (x=0.051 and 0.033) has been studied by neutron diffraction. We observe magnetic Bragg peaks associated with the same propagation vectors as found for the collinear stripe antiferromagnetic (AFM) order in the related BaFe2As2 (122) compound. The AFM state in 1144 preserves tetragonal symmetry and only a commensurate, noncollinear structure with a hedgehog spin-vortex crystal (SVC) arrangement in the Fe plane and simple AFM stacking along the c direction is consistent with our observations. The SVC order is promoted by the reduced symmetry in the FeAs layer in the 1144 structure. The long-range SVC order coexists with superconductivity, however, similar to the doped 122 compounds, the ordered magnetic moment is gradually suppressed with the developing superconducting order parameter. This supports the notion that both collinear and noncollinear magnetism and superconductivity are competing for the same electrons coupled by Fermi surface nesting in iron arsenide superconductors.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-07CH11358; AC02-06CH11357; GBMF4411; AC05-00OR22725
OSTI ID:
1460401
Alternate ID(s):
OSTI ID: 1457574; OSTI ID: 1468098
Report Number(s):
IS-J-9703; PRBMDO; TRN: US1901876
Journal Information:
Physical Review B, Vol. 97, Issue 22; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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Cited By (4)

Effect of pressure on the self-hole-doped superconductor RbGd 2 Fe 4 As 4 O 2 journal December 2018
Effect of Ni doping on vortex pinning in CaK ( F e 1 − x N i x ) 4 A s 4 single crystals journal August 2019
Analysis of the London penetration depth in Ni-doped CaKFe 4 As 4 journal September 2019
Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr 0.67 Na 0.33 Fe 2 As 2 journal December 2019

Figures / Tables (6)


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