Abstract
The measurements of magnetic hyperfine fields (MHF), Hhf, and isomer shift, δ, in Y(Fe1 – xNix)2 intermetallic compounds (the MgCu2 structure type) synthesized at high pressure are performed. The MHF values that appear on 57Fe nuclei at a nickel concentration x below 20 at % practically do not change and are approximately equal to 22 T, and in the range from x = 0.4 to 0.98 they decrease linearly with an increase in the Ni concentration. However, linear extrapolation of the hyperfine field as a function of Ni concentration does not lead to its disappearance in YNi2. For YFe2, the rotation of the easy axis from the [101] direction to the [111] direction with increasing temperature is found. As the Ni concentration increases to x = 0.3 at a temperature of 5 K, the easy magnetization axis [101] is observed, and at x = 0.4 the axis changes direction to [100]. Based on the shape of the concentration dependence of the hyperfine field, it is assumed that during the crystallization of Y(Fe1 – xNix)2 under high pressure conditions, a magnetic moment exists on Ni ions. First-principles calculations of magnetic properties and hyperfine interactions are performed, which are consistent with experiment.
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ACKNOWLEDGMENTS
The authors are grateful to V.I. Krylov for help with the experiment. This work was financially supported by Russian Science Foundation under Grant no. 22-22-00806 (https://rscf.ru/en/project/22-22-00806/). The numerical calculations were performed using computing resources of the federal collective usage center “Complex for Simulation and Data Processing for Mega-science Facilities” at NRC “Kurchatov Institute” (http://ckp.nrcki.ru/) and supercomputers at Joint Supercomputer Center of RAS (JSCC RAS).
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Bokov, A.V., Magnitskaya, M.V., Salamatin, D.A. et al. 57Fe Mössbauer Effect Study of Y(Fe1 – xNix)2 Synthesized under High Pressure. J. Exp. Theor. Phys. 136, 305–311 (2023). https://doi.org/10.1134/S1063776123020024
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DOI: https://doi.org/10.1134/S1063776123020024