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)†
State Key Laboratory of Magnetism and Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
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.
Received: 06 February 2009
Revised: 04 May 2009
Accepted manuscript online:
Fund: Project supported by the National
Basic Research Program of China (Grant No 2009CB929201) and the
National Natural Science Foundation of China (Grant No 10774179).
Cite this article:
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) Fe-doping induced Griffiths-like phase in La0.7Ba0.3CoO3 2009 Chin. Phys. B 18 5034
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