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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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| Cite this article: |
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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.
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| Keywords:
64.75.+g
75.47.Lx
71.30.+h
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Published: 01 October 2004
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