Role of Co Clusters and Oxygen Vacancies in the Magnetic and Transport Properties of Co-Doped In2O3 Films
An, YK; Yang, DY; Ma, GX; Zhu, Y; Wang, SQ; Wu, ZH; Liu, JW;吴忠华
刊名JOURNAL OF PHYSICAL CHEMISTRY C
2014
卷号118期号:19页码:10448-10454
学科分类Chemistry; Science & Technology - Other Topics; Materials Science
DOI10.1021/jp501560u
英文摘要The (In1-xCox)(2)O-3 films with x = (0.055, 0.08, 0.10, 0.15) have been prepared by a radio frequency magnetron sputtering technique and investigated by X-ray diffraction, X-ray photoelectron spectroscopy, X-ray absorption fine structure, Hall effect, and room-temperature magnetic measurements. The detailed structural analyses and full multiple-scattering ab initio calculations indicate that most Co2+ ions substitute for In3+ sites of In2O3 lattice and form Co-In(2+) + V-O complexes with the O vacancy in the nearest coordination shell, whereas a portion of the Co atoms form the precipitate of Co metal clusters for all the (In1-xCox)(2)O-3 films. Despite the formation of Co clusters, magnetic characterizations show that the saturated magnetization M-s of films first increases and then decreases with the increase of Co concentration, suggesting that the small Co clusters are superparamagnetic. The electronic conducting mechanism is dominated by Mott variable range hopping behavior for all the films. The strong localization of carriers suggests the bound magnetic polarons scenario. It can be concluded that the observed room-temperature ferromagnetism in the (In1-xCox)(2)O-3 films is intrinsic and originates from electrons bound in defect states associated with oxygen vacancies. There exists an optimal localization radius xi of variable range hopping for achieving the largest M-s in the (In1-xCox)(2)O-3 films.
收录类别SCI
WOS记录号WOS:000336198900069
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被引频次:6[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/225142
专题中国科学院高能物理研究所_多学科研究中心_期刊论文
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An, YK,Yang, DY,Ma, GX,et al. Role of Co Clusters and Oxygen Vacancies in the Magnetic and Transport Properties of Co-Doped In2O3 Films[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2014,118(19):10448-10454.
APA An, YK.,Yang, DY.,Ma, GX.,Zhu, Y.,Wang, SQ.,...&Liu, JW;吴忠华.(2014).Role of Co Clusters and Oxygen Vacancies in the Magnetic and Transport Properties of Co-Doped In2O3 Films.JOURNAL OF PHYSICAL CHEMISTRY C,118(19),10448-10454.
MLA An, YK,et al."Role of Co Clusters and Oxygen Vacancies in the Magnetic and Transport Properties of Co-Doped In2O3 Films".JOURNAL OF PHYSICAL CHEMISTRY C 118.19(2014):10448-10454.
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