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Title: Strong correlation between ferromagnetism and oxygen deficiency in Cr-doped In2 O3-δ nanostructures
Authors: Xing, G.Z.
Yi, J.B. 
Wang, D.D.
Liao, L.
Yu, T.
Shen, Z.X.
Huan, C.H.A.
Sum, T.C.
Ding, J. 
Wu, T.
Issue Date: 5-May-2009
Citation: Xing, G.Z., Yi, J.B., Wang, D.D., Liao, L., Yu, T., Shen, Z.X., Huan, C.H.A., Sum, T.C., Ding, J., Wu, T. (2009-05-05). Strong correlation between ferromagnetism and oxygen deficiency in Cr-doped In2 O3-δ nanostructures. Physical Review B - Condensed Matter and Materials Physics 79 (17) : -. ScholarBank@NUS Repository.
Abstract: Single-crystalline Cr-doped In2 O3-δ nanostructures with diverse morphologies including nanotowers, nanowires, and octahedrons are synthesized by using a vapor transport method. X-ray photoelectron spectroscopy results indicate that the as-grown samples contain 3 at.% Cr and are significantly oxygen deficient. The large surface-to-volume ratio in the nanostructures enhances their susceptibility to the postsynthesis treatments; high-temperature annealing in air boosts the oxygen contents in the samples, which is accompanied by a weakened defect-related emission in the photoluminescence spectra. Magnetization measurements on the as-grown and the annealed nanostructures suggest room-temperature ferromagnetism, and importantly the ferromagnetism is stronger in samples with higher oxygen deficiency. Electronic band alterations as a result of the Cr doping and the oxygen vacancies as well as the formation of bound magnetic polarons are suggested to play important roles in stabilizing the long-range ferromagnetism. © 2009 The American Physical Society.
Source Title: Physical Review B - Condensed Matter and Materials Physics
ISSN: 10980121
DOI: 10.1103/PhysRevB.79.174406
Appears in Collections:Staff Publications

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