A-site-doping enhanced B-site ordering and correlated magnetic property in La 2-xBi xCoMnO 6

Yijia Bai; Yanjie Xia; Hongping Li; Lin Han; Zhongchang Wang; Xiaojie Wu; Shuhui Lv; Xiaojuan Liu; Jian Meng

doi:10.1021/jp302735x

A-site-doping enhanced B-site ordering and correlated magnetic property in La _2-xBi _xCoMnO ₆

Yijia Bai, Yanjie Xia, Hongping Li, Lin Han, Zhongchang Wang, Xiaojie Wu, Shuhui Lv, Xiaojuan Liu, Jian Meng

Research output: Contribution to journal › Article › peer-review

29 Citations (Scopus)

Abstract

A series of Bi-doped La _2-xBi _xCoMnO ₆ double perovskite oxides are synthesized, and the impact of doping on crystal structures and magnetic properties is investigated comprehensively. X-ray photoelectron spectroscopy and Raman spectrum analyses reveal that ordering of Co and Mn ions at B-site is gradually improved with the rise of Bi concentration. Meanwhile, magnetic disordering is suppressed greatly by showing larger magnetic moments. Structurally, the Rietveld refinement shows that the bonds are elongated, while the bond angles are shrunken after doping, giving rise to lowered Curie temperature. We also observe a large negative zero-field-cooling magnetization, which is attributed to the formation of spin antiparallel or canted ferromagnetic domains and clusters that are separated by the antiphase boundaries. First-principles calculations confirm the enhanced Co-Mn ordering upon Bi doping by taking into account both the ordering and disordering configurations of La ₂CoMnO ₆, LaBiCoMnO ₆, and Bi ₂CoMnO ₆. Moreover, we find a spin-state transition in the antisite Co ions from high-spin (Co ²⁺-t _2g ⁵e _g ²) to low-spin state (Co ³⁺-t _2g ⁶e _g ⁰), which is consistent with the increased total magnetic moments by the Bi doping.

Original language	English
Pages (from-to)	16841-16847
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	116
Issue number	32
DOIs	https://doi.org/10.1021/jp302735x
Publication status	Published - 2012 Aug 16

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Electronic, Optical and Magnetic Materials
Surfaces, Coatings and Films
Energy(all)

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title = "A-site-doping enhanced B-site ordering and correlated magnetic property in La 2-xBi xCoMnO 6 ",

abstract = "A series of Bi-doped La 2-xBi xCoMnO 6 double perovskite oxides are synthesized, and the impact of doping on crystal structures and magnetic properties is investigated comprehensively. X-ray photoelectron spectroscopy and Raman spectrum analyses reveal that ordering of Co and Mn ions at B-site is gradually improved with the rise of Bi concentration. Meanwhile, magnetic disordering is suppressed greatly by showing larger magnetic moments. Structurally, the Rietveld refinement shows that the bonds are elongated, while the bond angles are shrunken after doping, giving rise to lowered Curie temperature. We also observe a large negative zero-field-cooling magnetization, which is attributed to the formation of spin antiparallel or canted ferromagnetic domains and clusters that are separated by the antiphase boundaries. First-principles calculations confirm the enhanced Co-Mn ordering upon Bi doping by taking into account both the ordering and disordering configurations of La 2CoMnO 6, LaBiCoMnO 6, and Bi 2CoMnO 6. Moreover, we find a spin-state transition in the antisite Co ions from high-spin (Co 2+-t 2g 5e g 2) to low-spin state (Co 3+-t 2g 6e g 0), which is consistent with the increased total magnetic moments by the Bi doping.",

author = "Yijia Bai and Yanjie Xia and Hongping Li and Lin Han and Zhongchang Wang and Xiaojie Wu and Shuhui Lv and Xiaojuan Liu and Jian Meng",

year = "2012",

month = aug,

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doi = "10.1021/jp302735x",

language = "English",

volume = "116",

pages = "16841--16847",

journal = "Journal of Physical Chemistry C",

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T1 - A-site-doping enhanced B-site ordering and correlated magnetic property in La 2-xBi xCoMnO 6

AU - Bai, Yijia

AU - Xia, Yanjie

AU - Li, Hongping

AU - Han, Lin

AU - Wang, Zhongchang

AU - Wu, Xiaojie

AU - Lv, Shuhui

AU - Liu, Xiaojuan

AU - Meng, Jian

PY - 2012/8/16

Y1 - 2012/8/16

N2 - A series of Bi-doped La 2-xBi xCoMnO 6 double perovskite oxides are synthesized, and the impact of doping on crystal structures and magnetic properties is investigated comprehensively. X-ray photoelectron spectroscopy and Raman spectrum analyses reveal that ordering of Co and Mn ions at B-site is gradually improved with the rise of Bi concentration. Meanwhile, magnetic disordering is suppressed greatly by showing larger magnetic moments. Structurally, the Rietveld refinement shows that the bonds are elongated, while the bond angles are shrunken after doping, giving rise to lowered Curie temperature. We also observe a large negative zero-field-cooling magnetization, which is attributed to the formation of spin antiparallel or canted ferromagnetic domains and clusters that are separated by the antiphase boundaries. First-principles calculations confirm the enhanced Co-Mn ordering upon Bi doping by taking into account both the ordering and disordering configurations of La 2CoMnO 6, LaBiCoMnO 6, and Bi 2CoMnO 6. Moreover, we find a spin-state transition in the antisite Co ions from high-spin (Co 2+-t 2g 5e g 2) to low-spin state (Co 3+-t 2g 6e g 0), which is consistent with the increased total magnetic moments by the Bi doping.

AB - A series of Bi-doped La 2-xBi xCoMnO 6 double perovskite oxides are synthesized, and the impact of doping on crystal structures and magnetic properties is investigated comprehensively. X-ray photoelectron spectroscopy and Raman spectrum analyses reveal that ordering of Co and Mn ions at B-site is gradually improved with the rise of Bi concentration. Meanwhile, magnetic disordering is suppressed greatly by showing larger magnetic moments. Structurally, the Rietveld refinement shows that the bonds are elongated, while the bond angles are shrunken after doping, giving rise to lowered Curie temperature. We also observe a large negative zero-field-cooling magnetization, which is attributed to the formation of spin antiparallel or canted ferromagnetic domains and clusters that are separated by the antiphase boundaries. First-principles calculations confirm the enhanced Co-Mn ordering upon Bi doping by taking into account both the ordering and disordering configurations of La 2CoMnO 6, LaBiCoMnO 6, and Bi 2CoMnO 6. Moreover, we find a spin-state transition in the antisite Co ions from high-spin (Co 2+-t 2g 5e g 2) to low-spin state (Co 3+-t 2g 6e g 0), which is consistent with the increased total magnetic moments by the Bi doping.

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A-site-doping enhanced B-site ordering and correlated magnetic property in La _2-xBi _xCoMnO ₆

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