Chin. Phys. Lett.  2004, Vol. 21 Issue (10): 2022-2025    DOI:
Original Articles |
Deoxygenation Enhanced Double-Resistivity-Peak Properties in Polycrystalline La0.7Ca0.3Mn0.92Cr0.08O3-δ
FANG Jun1;TIAN Jian-Jun1;WANG Fang1;SONG Wen-Hai2;HUANG Zhen1;CHEN Jing-Lin1
1High Magnetic Field Laboratory, Institute of Plasma Physics, Hefei 230031 2Key Laboratory of Materials Physics, Institute of Solid State Physics, Hefei 230031
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FANG Jun, TIAN Jian-Jun, WANG Fang et al  2004 Chin. Phys. Lett. 21 2022-2025
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Abstract Influences of deoxygenation on the resistivity and the magnetic properties of
La0.7Ca0.3Mn0.92Cr0.08O3-δ(M = Al, Cr) are compared to understand the peculiar doping effect of chromium in the ferromagnetic manganites. It is found that the double resistivity bumps exhibited by the Cr-doped compounds can be tuned by the oxygen content. We have related the double-bump feature with the well-known inefficiency of Cr in lowering TC, and interpreted both the features consistently in terms of large-scale phase separation. It is suggested that the
large-scale phase separation is a general characteristic of Cr-doped manganites, and many unusual phenomena exhibited by Cr doping are directly related to the large-scale phase separation.
Keywords: 64.75.+g      75.47.Lx      71.30.+h     
Published: 01 October 2004
PACS:  64.75.+g  
  75.47.Lx (Magnetic oxides)  
  71.30.+h (Metal-insulator transitions and other electronic transitions)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2004/V21/I10/02022
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FANG Jun
TIAN Jian-Jun
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SONG Wen-Hai
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