Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 48: Poster Session II

MA 48.2: Poster

Donnerstag, 10. März 2016, 15:00–18:00, Poster B1

Magnetic properties of Ce³⁺ ions in Nb-doped cerium dioxide — •Olga Gornostaeva¹ and Taras Kolodiazhnyi² — ¹Donetsk National University, Vinnytsia, Ukraine — ²National Institute for Materials Science, Tsukuba, Japan

Dilute magnetic oxides are currently attracting much attention in view of their potential for applications in spintronics and magneto-optical devices. In particular, it relates doped cerium dioxide. We have performed theoretical and experimental studies of crystal-field effects on magnetic properties of Nb-doped CeO₂. Using the crystallographic data for the abovementioned compound and the modified crystal-field theory, a novel computational approach, we have calculated energy levels of the Ce³⁺ ions and g-factor values. It was found that the Γ₈ ground state is separated from the overlying Γ₇ state by 173 cm⁻¹ in good agreement with the optical transmission data. With the g-factor value and related experimental data, we found the Curie-Weiss constant and get a percentage of Ce³⁺ ions in a mole of the substance. Comparison of calculated and experimentally measured temperature dependences of the magnetic susceptibility in Nb-doped and undoped cerium dioxide allowed us to estimate the contribution of Ce³⁺ ions to the magnetism of the dilute magnetic oxide.