Electron-spin resonance of Gd in LaNi5 single crystals: Resolved fine structure in hexagonal host and the role of random strains

R. Levin*, A. Grayevskey, D. Shaltiel, V. Zevin, D. Davidov

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Electron-spin resonance (ESR) of Gd in LaNi5 single crystals exhibits partially resolved ESR spectra in the helium temperature range appropriate to Gd in hexagonal environment. This is interpreted by the small Korringa broadening with respect to the hexagonal crystalline-field parameter D, as well as by the absence of bottleneck in the relaxation mechanism. A line-shape analysis together with axial spin Hamiltonian yields D=25030 G and an isotropic g value: g=1.850.01. The ESR spectra is shown to be affected significantly by the presence of random stresses. The Barnes-Plefka theory together with a random stress model can explain all the experimental features satisfactorily. It is pointed out that random stresses are a common feature to many single crystals of dilute alloys. In particular, the ESR spectra of LaSb: Gd published previously is reanalyzed in terms of our stress model. Annealing of our LaNi5: Gd single crystals leads to the appearance of a "ferromagnetic resonance" appropriate to hexagonal symmetry. The origin of this resonance is probably associated with induced magnetic domains by slight chemical changes in the strongly exchange enhanced LaNi5 host.

Original languageEnglish
Pages (from-to)2624-2633
Number of pages10
JournalPhysical Review B
Volume20
Issue number7
DOIs
StatePublished - 1979

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