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

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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 P5 KP: 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 P5 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.

Original languageEnglish
Pages (from-to)463-466
Number of pages4
JournalSolid State Communications
Volume102
Issue number6
DOIs
Publication statusPublished - 1997 Jan 1

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Magnetoresistance
Oxides
Grain boundaries
grain boundaries
electrical resistivity
oxides
Galvanomagnetic effects
Manganites
Polycrystals
Magnetic properties
Crystalline materials
polycrystals
manganite
magnetic properties
Temperature

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

Cite this

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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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Role of grain boundaries in double exchange manganite oxides La1-xAxMnO3 (A = Ba, Ca). / Ju, Honglyoul; Sohn, Hyunchul.

In: Solid State Communications, Vol. 102, No. 6, 01.01.1997, p. 463-466.

Research output: Contribution to journalArticle

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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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