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Type: Artigo de periódico
Title: Electron Spin Resonance Of Nd3+ And Gd3+ In D-band Intermetallic Compounds
Author: Barberis G.E.
Davidov D.
Donoso J.P.
Rettori C.
Suassuna J.F.
Dokter H.D.
Abstract: We report on the ESR of the rare-earth ions Nd3+, Gd3+, Er3+, and Yb3+ on powdered samples of various intermetallic compounds of AB2 cubic structure where B is a transition-metal ion belonging to the group VIII of the Periodic Table, and A is a nonmagnetic ion (La, Ce, Y). The resonance of the Nd3+ in these compounds originates within a Γ6 crystal-field ground level and exhibits resolved hyperfine satellites for the Nd143 and Nd145 isotopes. The Gd3+ spectra show a single isotropic line. Using our data for Gd3+ and Nd3+ together with results previously published for the AB2 cubic compounds, we were able to show a correlation between the observed g shifts and the position of the B ion in the Periodic Table. This variation is explained qualitatively using a simple multiband model, as well as band-structure arguments. The hyperfine constants for the Nd143 and Nd145 isotopes were found smaller in magnitude with respect to the values in insulators; this effect is attributed to s-electron self-polarization due to the Nd localized-moment-s-electron exchange coupling. The ESR linewidths of LaIr2: Nd and LaRh2: Nd exhibit an exponential thermal dependence at high temperatures which is attributed to the presence of a Γ8 excited level at Δ=90±20 K. © 1979 The American Physical Society.
Citation: Physical Review B. , v. 19, n. 11, p. 5495 - 5506, 1979.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.19.5495
Date Issue: 1979
Appears in Collections:Unicamp - Artigos e Outros Documentos

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