Magnetic properties of RNi5−xCux intermetallics

Кучин, А. Г.; Ermolenko, A. S.; Kulikov, Yu.A.; Khrabrov, V. I.; Rosenfeld, E. V.; Makarova, G. M.; Lapina, T. P.; Belozerov, Ye.V.

doi:10.1016/j.jmmm.2005.10.235

Cited by 41 publications

(40 citation statements)

References 24 publications

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“…Significant modifications of some properties owing to the doping effect were found also in ferromagnetic SmNi 5-x Cu x system (the Curie temperature T C for binary SmNi 5 is 30 K [2]). The substitution of Cu for Ni is accompanied by decreasing of spontaneous magnetic moment and increasing of coercive force, which indicates the presence of crystal electric field effect [2].…”

Section: Introductionmentioning

confidence: 92%

“…The substitution of Cu for Ni is accompanied by decreasing of spontaneous magnetic moment and increasing of coercive force, which indicates the presence of crystal electric field effect [2]. Also it was shown that T C displays nonmonotonic concentration dependence with the maximum at x ~ 1.…”

Section: Introductionmentioning

confidence: 93%

“…The intraband absorption is determined by the kinetic parameters of the conduction electrons -the relaxation γ and plasma ω p frequencies. The relaxation frequency 2 1 / γ = ε ω ε additively takes into account all types of electron scattering upon excitation by the electromagnetic field, and in the limit ω → 0 it is determined by the static electrical resistivity. The squared plasma frequency 2 2 2 2 1 2 1 ( )/ P ω = ω ε + ε ε is proportional to the Fermi velocity of electrons and their concentration.…”

Section: Experimental and Calculation Detailsmentioning

confidence: 99%

“…The relaxation frequency 2 1 / γ = ε ω ε additively takes into account all types of electron scattering upon excitation by the electromagnetic field, and in the limit ω → 0 it is determined by the static electrical resistivity. The squared plasma frequency 2 2 2 2 1 2 1 ( )/ P ω = ω ε + ε ε is proportional to the Fermi velocity of electrons and their concentration. It is known [15] that in the single-electron approximation for an arbitrary dispersion relation E(k) the 2 P ω is proportional to the density of states at E F .…”

Section: Experimental and Calculation Detailsmentioning

confidence: 99%

“…The RNi 5 group of intermetallic compounds (where R is a rare earth) and their substitutional derivatives have been extensively studied because of a variety of interesting properties promising for practical applications, such as magnetocaloric effect, hydrogen storage capacity, magnetic anisotropy and high coercivity [1][2][3][4][5][6]. Their diverse magnetic and electronic characteristics are associated with both localized moments of R atoms and itinerant electrons of Ni atoms in hexagonal CaCu 5 -type structure.…”

Section: Introductionmentioning

confidence: 99%

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Copper-doping effects in electronic structure and spectral properties of SmNi5

Knyazev

Lukoyanov

Kuz’min

et al. 2015

Low Temperature Physics

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The electronic structure and optical properties of the SmNi 5-x Cu x (x = 0, 1, 2) compounds are studied. The band spectra of the studied intermetallics were calculated with LDA+U+SO method supplementing the local density approximation with a correction for strong electron interaction on the shell of the rare-earth element. Optical properties were studied by ellipsometry method in the wide wavelength range. It was found that the substitution of copper for nickel leads to local changes in the optical conductivity spectra. Both the spectroscopic measurements and theoretical calculations demonstrate the presence of a broad absorption band around 4 eV associated with the Cu 3d → Ni 3d electron transitions and increasing with the grown of copper content. The experimental dispersion curves of optical conductivity in the interband absorption region were interpreted using the results of the calculations.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 93%

Section: Experimental and Calculation Detailsmentioning

confidence: 99%

Section: Experimental and Calculation Detailsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Copper-doping effects in electronic structure and spectral properties of SmNi5

Knyazev

Lukoyanov

Kuz’min

et al. 2015

Low Temperature Physics

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Magnetocaloric Effect in SmNi2 Compound

et al. 2019

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The structure and magnetocaloric properties of SmNi 2 intermetallic material has been studied by X-ray diffraction and magnetic measurements. Rietveld refinements and energy dispersive X-ray spectroscopy detector show that the SmNi 2 intermetallic is single phase. This intermetallic adopts the MgCu 2 structure type of cubic Laves phase (space group Fd3m) and stabilizes without vacancy in Sm site. The magnetic properties and the entropy change have been investigated by the magnetic measurements. The compound obeys to the second-order magnetic phase transition. The Curie temperature of SmNi 2 is determined by the minima of dM/dT. The magnetocaloric effect has been estimated using two different approaches, the thermodynamic Maxwell's relation and the Landau theory. These studies are discussed in terms of magnetocaloric effect (MCE). The maximum value of the magnetic entropy (ΔS M) is equal to 1.82 J/kg K and the relative cooling power for SmNi 2 is equal to 23.5 J/kg. Besides, the MCE analysis proves a contribution of the magnetoelastic coupling to the entropy change.

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