Issue
EPL
Volume 87, Number 6, September 2009
Article Number 67006
Number of page(s) 3
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/87/67006
Published online 09 October 2009
EPL, 87 (2009) 67006
DOI: 10.1209/0295-5075/87/67006

Charge factor, symmetry and electrostatics in europium compounds

M. A. Couto dos Santos

DFI/UFS - 49100-000 São Cristóvão, SE, Brazil

msantos@fisica.ufs.br

received 13 July 2009; accepted in final form 10 September 2009; published September 2009
published online 9 October 2009

Abstract
Symmetry and electrostatic equilibrium in europium compounds are revisited with the aim of improving the role of obtaining the charge factors (gj), of the nearest neighbours (NN) of the lanthanide site, j running over the NN, now using the gj vs. Rj (the NN position) linear behaviour. An inferior limit of the gj position is predicted. Further, an indication that the $B^{\rm 4}_{q}$ and $B^{\rm 6}_{q}$ crystal field parameters may not exactly depend on gj or Rj in the same way as the $B^{\rm 2}_{q}$ parameter is, at least, made.

PACS
71.70.Ch - Crystal and ligand fields.
78.20.Bh - Theory, models, and numerical simulation.
78.55.Hx - Other solid inorganic materials.

© EPLA 2009