R3(Fe,T)29 intermetallic compounds - Magnetoelastic coupling in Sm3(CoxFe1-x)29-yCry
Publication Name
Journal of Magnetism and Magnetic Materials
Abstract
The thermal expansion of the rare earth intermetallic compounds Sm (Co Fe ) Cr (x = 0.9, y = 7; x = 0.8, y = 6.5; x = 0.7, y = 6) have been systematically investigated by high resolution synchrotron x-ray diffraction measurements (~120–480 K; ~ 300–823 K). The magnetic and thermal properties of Sm (Fe Co ) Cr have been studied as a typical example of the Sm (Co Fe ) Cr system by magnetic measurements (ac susceptibility, ~ 5–300 K; DC magnetisation, ~ 77–650 K) and specific heat measurements (~2–300 K). The Debye temperature of Sm (Co Fe ) Cr was found to be θ = 410 ± 10 K from analyses of the specific heat data while the density of states at the Fermi level was N(E ) = 5.08 ± 0. 04 ev atom . A pronounced contribution of the nuclear specific heat of Sm (Co Fe ) Cr is evident below 5 K with the nuclear specific heat coefficient found to be A = 758 ± 30 mJ mol K . Rietveld analyses of the x-ray diffraction data demonstrate the remarkable magneto-volume anomalies of Sm (Co Fe ) Cr around their Curie temperatures T with negative values of the volume magnetostriction detected below the Curie temperatures and values in the range ω = − 1.1 × 10 to ω = − 4.3 × 10 at 300 K. 3 x 1-x 29-y y 3 0.9 0.1 24 4 3 x 1-x 29-y y 3 0.9 0.1 22 7 D F 3 0.9 0.1 22 7 3 x 1-x 29-y y C s s −1 −1 −1 −1 −3 −3
Open Access Status
This publication is not available as open access
Volume
533
Article Number
168013