Europium c -axis ferromagnetism in Eu(Co1-xNix)2-yAs2 : A single-crystal neutron diffraction study

Han, Tianxiong; Pakhira, Santanu; Sangeetha, N. S.; Riberolles, S. X. M.; Heitmann, T. W.; Wu, Yan; Johnston, D. C.; McQueeney, R. J.; Ueland, B. G.

doi:10.1103/physrevb.109.174428

Europium c -axis ferromagnetism in Eu ( Co 1-x Nix ) 2-y As2 : A single-crystal neutron diffraction study

Journal Article · Thu May 16 00:00:00 EDT 2024 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.109.174428· OSTI ID:2367350

^[1]; ^[2]; ^[2]; Riberolles, S. X. M. ^[2]; Heitmann, T. W. ^[3]; ^[4]; ^[1]; McQueeney, R. J. ^[1]; ^[1]

Ames Laboratory (AMES), Ames, IA (United States); Iowa State University, Ames, IA (United States)
Ames Laboratory (AMES), Ames, IA (United States)
University of Missouri, Columbia, MO (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division

Here we report neutron diffraction results for the body-centered-tetragonal series Eu⁢(Co_1-x⁢Ni_x)_2-yAs₂, x=0.10, 0.20, 0.42, and 0.82, y≤0.10, that detail changes to the magnetic ordering with nominal hole doping. We report the antiferromagnetic (AFM) propagation vectors, magnetic transition temperatures, and the ordered magnetic moments. We find a nonmonotonic change of the AFM propagation vector with x, with a minimum occurring at the tetragonal to collapsed-tetragonal phase crossover. For x=0.10 and 0.82 we find c-axis helix ordering of the Eu magnetic moments (spins) similar to x=0 and 1, with the spins oriented within the ab-plane. For x=0.20 and 0.42 we find higher-temperature c-axis ferromagnetic (FM) order and lower-temperature c-axis cone order. Using the extinction conditions for the space group, we discovered that the Eu spins are ordered in the higher-temperature c-axis FM phase for intermediate values of x, contrary to a previous report suggesting only Co/Ni spin ordering. Although we cannot directly confirm that the Co/Ni spins are also ordered, we suggest that c-axis itinerant-FM ordering of the Co/Ni spins could provide a molecular field that drives FM ordering of the Eu spins, which in turn provides the anisotropy for the lower-temperature c-axis cone order.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-07CH11358; AC05-00OR22725

OSTI ID:: 2367350

Alternate ID(s):: OSTI ID: 2356928
OSTI ID: 2371076

Report Number(s):: IS-J--11,335

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 17 Vol. 109; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Europium c -axis ferromagnetism in Eu ( Co 1-x Nix ) 2-y As2 : A single-crystal neutron diffraction study

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