TY - JOUR
T1 - Role of grain boundaries in double exchange manganite oxides La1-xAxMnO3 (A = Ba, Ca)
AU - Ju, H. L.
AU - Sohn, Hyunchul
N1 - Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 1997/5
Y1 - 1997/5
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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U2 - 10.1016/S0038-1098(97)00031-8
DO - 10.1016/S0038-1098(97)00031-8
M3 - Article
AN - SCOPUS:0031144916
VL - 102
SP - 463
EP - 466
JO - Solid State Communications
JF - Solid State Communications
SN - 0038-1098
IS - 6
ER -