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Type: Artigo de periódico
Title: Stress Effects On The Electron-spin-resonance Spectra Of Er In Gold And Silver Thin Films
Author: Pela C.A.
Suassuna J.F.
Barberis G.E.
Rettori C.
Abstract: Electron-spin-resonance measurements were carried out at liquid-helium temperatures on diluted Er in Au and Ag thin films (300-5000) evaporated on NaCl and quartz substrates. The observed anisotropy of the g value, linewidth, and line shape are explained by the mixing of excited crystalline field levels with the 7 ground state: These admixtures are caused by the stresses induced by the difference between the thermal expansion coefficients of the substrate and the film. Lower limits for the tetragonal and trigonal second-order orbit-lattice coupling parameters can be estimated from the data. In Au their magnitude and sign agree with those predicted by the point-charge model, while in Ag the trigonal parameter does not. Qualitative information about the strain distribution across the film was obtained by employing the anisotropy of the g value, the linewidth, and the line shape together with x rays and electron-microscopy analysis. © 1981 The American Physical Society.
Citation: Physical Review B. , v. 23, n. 7, p. 3149 - 3158, 1981.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.23.3149
Date Issue: 1981
Appears in Collections:Unicamp - Artigos e Outros Documentos

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