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Exchange and crystal field effects in the ESR spectra of Eu2+ in la B6
Authors
JGS Duque
Z Fisk
+5 more
SB Oseroff
PG Pagliuso
C Rettori
RR Urbano
PA Venegas
Publication date
26 September 2007
Publisher
eScholarship, University of California
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
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Last time updated on 25/12/2021