中国物理B ›› 2009, Vol. 18 ›› Issue (11): 5034-5037.doi: 10.1088/1674-1056/18/11/070

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Fe-doping induced Griffiths-like phase in La0.7Ba0.3CoO3

黄万国, 张向群, 李国科, 孙阳, 李庆安, 成昭华   

  1. State Key Laboratory of Magnetism and Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2009-02-06 修回日期:2009-05-04 出版日期:2009-11-20 发布日期:2009-11-20
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No 2009CB929201) and the National Natural Science Foundation of China (Grant No 10774179).

Fe-doping induced Griffiths-like phase in La0.7Ba0.3CoO3

Huang Wan-Guo(黄万国), Zhang Xiang-Qun(张向群), Li Guo-Ke(李国科), Sun Young(孙阳), Li Qing-An(李庆安), and Cheng Zhao-Hua(成昭华)†   

  1. State Key Laboratory of Magnetism and Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2009-02-06 Revised:2009-05-04 Online:2009-11-20 Published:2009-11-20
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No 2009CB929201) and the National Natural Science Foundation of China (Grant No 10774179).

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摘要： The effect of Fe-doping on the magnetic properties of the ABO3-type perovskite cobaltites La0.7Ba0.3Co_1 - yFe_yO3 (0 ≤ y ≤ 0.80) is reported. With no apparent structural change in any doped sample, the Curie temperature (TC) and the magnetization (M) are greatly suppressed for y ≤ 0.30 samples, while a distinct increase in TC for the y=0.40 sample is observed. With the further increase of Fe concentration, TC increases monotonically. Griffiths-like phases in 0.40 ≤ y ≤ 0.60 samples are confirmed. The formation of the Griffiths-like phase is ascribed to B-site disordering induced isolation of ferromagnetic (FM) clusters above TC.

Abstract: The effect of Fe-doping on the magnetic properties of the ABO3-type perovskite cobaltites La0.7Ba0.3Co1-yFeyO3 (0 ≤ y ≤ 0.80) is reported. With no apparent structural change in any doped sample, the Curie temperature (TC) and the magnetization (M) are greatly suppressed for y ≤ 0.30 samples, while a distinct increase in TC for the y = 0.40 sample is observed. With the further increase of Fe concentration, TC increases monotonically. Griffiths-like phases in 0.40 ≤ y ≤ 0.60 samples are confirmed. The formation of the Griffiths-like phase is ascribed to B-site disordering induced isolation of ferromagnetic (FM) clusters above TC.

Key words: perovskite cobaltites, Fe doping, Griffiths phase

中图分类号:  (III-V and II-VI semiconductors)

  • 61.72.uj
75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 75.50.Dd (Nonmetallic ferromagnetic materials) 75.47.Gk (Colossal magnetoresistance)