Eur. Phys. J. B 29, 79-84 (2002)
https://doi.org/10.1140/epjb/e2002-00264-0

Crystal-field and superposition model analysis of R³⁺:BaY₂F₈ (R = Er, Dy, Nd)

INFM and Dipartimento di Fisica, Università di Parma, Parco Area delle Scienze 7/A, 43100 Parma, Italy

Corresponding author: ^a Giuseppe.Amoretti@fis.unipr.it

Received: 14 May 2002
Revised: 12 July 2002
Published online: 17 September 2002

Abstract

The experimental values of the energy levels of Er³⁺, Dy³⁺, and Nd³⁺ in BaY₂F₈ were fitted to a single-ion Hamiltonian containing free-ion and crystal-field interactions. The crystal-field parameters so evaluated were then analyzed by using Newman's Superposition Model. The agreement between the two sets of parameters is good, provided a possible distortion of the F^- polyhedron around the rare-earth site is taken into account. The effects of a possible displacement of the rare-earth ion substituting for Y³⁺ are also evaluated.