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Effect on the magnetic properties of small substitutions of iron and copper for nickel in YNi3 and Y2Ni7 intermetallics

  • Magnetism and Ferroelectricity
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Abstract

Measurements of magnetization in static fields up to 60 kOe and magnetic susceptibility in weak ac fields of the Y(Ni1−x Mx)3 and Y2(Ni1−x Mx)7 intermetallics (M=Fe and Cu, x max=0.2), as well of the specific heat of these systems for some compositions are reported. It was found that these intermetallics are ferromagnetic at low temperature, and that their spontaneous magnetizations M s at 4.2 K and Curie temperatures T C decrease monotonically with increasing copper concentration. The magnetic susceptibility of the Y(Ni1−x Fex)3 system with 0.06≲x≲0.2 was observed to decrease rapidly with the temperature lowered below a characteristic temperature T s. One of possible reasons for such an anomaly is shown to be the onset in this concentration region of the reentrant spin-glass state at low temperatures. The results obtained demonstrate that the tight-binding d-band model fails to explain the evolution of the magnetic properties of YNi3 and Y2Ni7 in the case of small substitutions of iron and copper for nickel.

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Fiz. Tverd. Tela (St. Petersburg) 39, 1828–1830 (October 1997)

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Levitin, R.Z., Markosyan, A.S., Petropavlovskii, A.B. et al. Effect on the magnetic properties of small substitutions of iron and copper for nickel in YNi3 and Y2Ni7 intermetallics. Phys. Solid State 39, 1633–1635 (1997). https://doi.org/10.1134/1.1129910

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  • DOI: https://doi.org/10.1134/1.1129910

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