Strong correlation between ferromagnetism and oxygen deficiency in Cr-doped In2 O3-δ nanostructures

G. Z. Xing, J. B. Yi, D. D. Wang, L. Liao, T. Yu, Z. X. Shen, C. H.A. Huan, T. C. Sum, J. Ding, Tao Wu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

151 Scopus citations

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.

Original languageEnglish (US)
Article number174406
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number17
DOIs
StatePublished - May 5 2009

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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