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

Journal Article · · Physical Review. B
 [1];  [2];  [2];  [2];  [3];  [4];  [1];  [1];  [1]
  1. Ames Laboratory (AMES), Ames, IA (United States); Iowa State University, Ames, IA (United States)
  2. Ames Laboratory (AMES), Ames, IA (United States)
  3. University of Missouri, Columbia, MO (United States)
  4. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
+ Show Author Affiliations

Here we report neutron diffraction results for the body-centered-tetragonal series Eu⁢(Co1-x⁢Nix)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.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
AC02-07CH11358
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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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
antiferromagnetism
antiferromagnets
ferromagnetism
helimagnets
intermetallic compounds
magnetic anisotropy
magnetic order
magnetic phase transitions
neutron diffraction
noncollinear magnets
rare-earth magnetic materials
single crystal materials