Magnetic, optical, and electron transport properties of n-type CeO2: Small polarons versus Anderson localization MAGNETIC, OPTICAL, and ELECTRON TRANSPORT ... TARAS KOLODIAZHNYI et al.

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dc.contributor.authorKolodiazhnyi, Taras
dc.contributor.authorCharoonsuk, Thitirat
dc.contributor.authorSeo, Yu Seong
dc.contributor.authorChang, Suyong
dc.contributor.authorVittayakorn, Naratip
dc.contributor.authorHwang, Jungseek
dc.date.accessioned2026-08-06T10:15:52Z
dc.date.available2026-08-06T10:15:52Z
dc.date.issued2017-01-11
dc.description.abstractWe report magnetic susceptibility, electrical conductivity and optical absorption of Ce1-xMxO2 where M = Nb,Ta and 0≤x≤0.03. The dc conductivity follows a simple thermally activated Arrhenius-type behavior in the T=70-700 K range with a change in slope at T∗≈155 K. The high-temperature activation energy shows gradual increase from ≈170 to 220 meV as the dopant concentration increases. The activation energy of the low-temperature conductivity shows a broad minimum of ≈77 meV at x≈0.01. Electron transport and localization mechanisms are analyzed in the framework of the Holstein small polaron, Anderson localization, and Jahn-Teller distortion models. The fit to the small polaron mobility is dramatically improved when, instead of the longitudinal phonons, the transverse optical phonons are considered in the phonon-assisted electron transport. This serves as an indirect evidence of a strong 4f1 orbital interaction with the oxygen ligands, similar to the case of PrO2. Based on comparison of the experimental data to the models, it is proposed that the defect-induced random electric fields make the dominant contribution to the electron localization in donor-doped ceria.
dc.identifier.citationPhysical Review B, 95(4), 2017
dc.identifier.doi10.1103/PhysRevB.95.045203
dc.identifier.issn24699950
dc.identifier.other2-s2.0-85010788181
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/7439
dc.sourcePhysical Review B
dc.titleMagnetic, optical, and electron transport properties of n-type CeO2: Small polarons versus Anderson localization MAGNETIC, OPTICAL, and ELECTRON TRANSPORT ... TARAS KOLODIAZHNYI et al.
dc.typeArticle

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