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Type: Artigo de periódico
Title: Exchange And Crystal Field Effects In The Esr Spectra Of Eu2+ In La B6
Author: Duque J.G.S.
Urbano R.R.
Venegas P.A.
Pagliuso P.G.
Rettori C.
Fisk Z.
Oseroff S.B.
Abstract: Electron spin resonance of Eu2+ (4 f7, S=7 2) in a La hexaboride (La B6) single crystal shows a single anisotropic Dysonian resonance. From the observed negative g shift of the resonance, it is inferred that the Eu2+ ions are covalent exchange coupled to the B 2p -like host conduction electrons. From the anisotropy of the spectra (linewidth and field for resonance), we found that the S ground state of Eu2+ ions experience a cubic crystal field of a negative fourth order crystal field parameter (CFP), b4 =-11.5 (2.0) Oe, in agreement with the negative fourth order CFP, A4, found for the non- S ground state R hexaborides. These results support covalency as the dominant contribution to the fourth order CFP for the whole R hexaboride family. © 2007 The American Physical Society.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.76.125114
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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