Role of grain boundaries in double exchange manganite oxides La1-xAxMnO3 (A = Ba, Ca)

H. L. Ju; Hyunchul Sohn

doi:10.1016/S0038-1098(97)00031-8

Role of grain boundaries in double exchange manganite oxides La_1-xA_xMnO₃ (A = Ba, Ca)

H. L. Ju, Hyunchul Sohn

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

93 Citations (Scopus)

Abstract

We report the study of magnetotransport and magnetic properties of manganite oxides La_1-xA_xMnO₃ (A = Ba, Ca). We have observed that polycrystalline manganite shows a different resistivity behavior from that of single crystalline material in that the former shows a small ρ _P/ρ _{5 K} (ρ _P: peak resistivity, ρ_{5 K}: resistivity at 5 K) ratio and a large magnetoresistance (MR) effect at T ≪ T_C, whereas the latter shows a large ρ _P/ρ _{5 K} ratio and no significant MR at low temperature, due to grain boundary contribution to the resistivity. A La_0.67Ba_0.33MnO_2.99 sample with a polycrystal size of 5 μm showed the grain boundary resistivity 150 times as large as the grain resistivity at 5 K. A possible origin of low-field MR in polycrystalline manganites has been discussed.

Original language	English
Pages (from-to)	463-466
Number of pages	4
Journal	Solid State Communications
Volume	102
Issue number	6
DOIs	https://doi.org/10.1016/S0038-1098(97)00031-8
Publication status	Published - 1997 May

All Science Journal Classification (ASJC) codes

Chemistry(all)
Condensed Matter Physics
Materials Chemistry

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abstract = "We report the study of magnetotransport and magnetic properties of manganite oxides La1-xAxMnO3 (A = Ba, Ca). We have observed that polycrystalline manganite shows a different resistivity behavior from that of single crystalline material in that the former shows a small ρ P/ρ 5 K (ρ P: peak resistivity, ρ5 K: resistivity at 5 K) ratio and a large magnetoresistance (MR) effect at T ≪ TC, whereas the latter shows a large ρ P/ρ 5 K ratio and no significant MR at low temperature, due to grain boundary contribution to the resistivity. A La0.67Ba0.33MnO2.99 sample with a polycrystal size of 5 μm showed the grain boundary resistivity 150 times as large as the grain resistivity at 5 K. A possible origin of low-field MR in polycrystalline manganites has been discussed.",

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AU - Ju, H. L.

AU - Sohn, Hyunchul

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N2 - We report the study of magnetotransport and magnetic properties of manganite oxides La1-xAxMnO3 (A = Ba, Ca). We have observed that polycrystalline manganite shows a different resistivity behavior from that of single crystalline material in that the former shows a small ρ P/ρ 5 K (ρ P: peak resistivity, ρ5 K: resistivity at 5 K) ratio and a large magnetoresistance (MR) effect at T ≪ TC, whereas the latter shows a large ρ P/ρ 5 K ratio and no significant MR at low temperature, due to grain boundary contribution to the resistivity. A La0.67Ba0.33MnO2.99 sample with a polycrystal size of 5 μm showed the grain boundary resistivity 150 times as large as the grain resistivity at 5 K. A possible origin of low-field MR in polycrystalline manganites has been discussed.

AB - We report the study of magnetotransport and magnetic properties of manganite oxides La1-xAxMnO3 (A = Ba, Ca). We have observed that polycrystalline manganite shows a different resistivity behavior from that of single crystalline material in that the former shows a small ρ P/ρ 5 K (ρ P: peak resistivity, ρ5 K: resistivity at 5 K) ratio and a large magnetoresistance (MR) effect at T ≪ TC, whereas the latter shows a large ρ P/ρ 5 K ratio and no significant MR at low temperature, due to grain boundary contribution to the resistivity. A La0.67Ba0.33MnO2.99 sample with a polycrystal size of 5 μm showed the grain boundary resistivity 150 times as large as the grain resistivity at 5 K. A possible origin of low-field MR in polycrystalline manganites has been discussed.

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