Electronic structure and properties of EuO and EuS in the molecular-cluster approximation

E. Byrom*, D. E. Ellis, A. J. Freeman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


Molecular-cluster models are developed to describe ground-state properties of EuO and EuS in the Hartree-Fock-Slater one-electron approximation. Spin-polarized (EuX6)10- complexes are examined using both neutral- and ionic-model potentials which incorporate a part of the effect of the crystalline environment. Self-consistent calculations are made for (EuO6)10-. From the charge and spin densities, the transferred hyperfine field at the O site in EuO is found to be -8 ± 2 kG and a small solid-state bonding effect is predicted for the neutron magnetic form factor. The pressure dependence of the charge density at the Eu nucleus in EuS is determined as a function of bond length in the (EuS6)10- cluster and used to obtain from the experimental data an isomer-shift calibration constant α=-0.48a03 mm/sec. The one-electron energy levels of the (EuO6)10- cluster are found to be in good agreement with the augmented-plane-wave results of Cho when both calculations are performed with similar model potentials. The extension to self-consistency leads to significant energy-level rearrangement which indicates the importance of final-state relaxation and Coulomb correlation effects in the interpretation of experimental spectra.

Original languageEnglish (US)
Pages (from-to)3558-3568
Number of pages11
JournalPhysical Review B
Issue number8
StatePublished - 1976

ASJC Scopus subject areas

  • Condensed Matter Physics


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