Crystal field analysis of the energy level structure of Cs₂NaAlF₆: Cr³⁺

Czeslaw RUDOWICZ, Mikhail G. BRIK, Nicolae M. AVRAM, Yau Yuen YEUNG, Pawel GNUTEK

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Abstract

An analysis of the energy level structure of Cr³⁺ ions in Cs₂NaAlF₆ crystal is performed using the exchange charge model (ECM) together with the crystal field analysis/microscopic spin Hamiltonian (CFA/MSH) computer package. Utilizing the crystal structure data, our approach enables modelling of the crystal field parameters (CFPs) and thus the energy level structure for Cr³⁺ ions at the two crystallographically inequivalent sites in Cs₂NaAlF₆. Using the ECM initial adjustment procedure, the CFPs are calculated in the crystallographic axis system centred at the Cr³⁺ ion at each site. Additionally the CFPs are also calculated using the superposition model (SPM). The ECM and SPM predicted CFP values match very well. Consideration of the symmetry aspects for the so-obtained CFP datasets reveals that the latter axis system matches the symmetry-adapted axis system related directly to the six Cr–F bonds well. Using the ECM predicted CFPs as an input for the CFA/MSH package, the complete energy level schemes are calculated for Cr³⁺ ions at the two sites. Comparison of the theoretical results with the experimental spectroscopic data yields satisfactory agreement. Our results confirm that the actual symmetry at both impurity sites I and II in the Cs₂NaAlF₆:Cr³⁺ system is trigonal D₃d. The ECM predicted CFPs may be used as the initial (starting) parameters for simulations and fittings of the energy levels for Cr³⁺ ions in structurally similar hosts. Copyright © 2006 IOP Publishing.
Original languageEnglish
Pages (from-to)5221-5234
JournalJournal of Physics: Condensed Matter
Volume18
Issue number22
DOIs
Publication statusPublished - May 2006

Citation

Rudowicz, C., Brik, M. G., Avram, N. M., Yeung, Y. Y., & Gnutek, P. (2006). Crystal field analysis of the energy level structure of Cs₂NaAlF₆: Cr³⁺. Journal of Physics: Condensed Matter, 18(22), 5221-5234.

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