Enhanced metal-insulator transition and magnetoresistance in melt-processed La0.67Ca0.33MnO3 and Ho-doped manganites

被引：19
作者：
Pradhan, AK
Roul, BK
Feng, Y
Wu, Y
Mohanty, S
Sahu, DR
Dutta, P
机构：
[1] Inst Mat Sci, Bhubaneswar 751005, Orissa, India
[2] SRL ISTEC, Koto Ku, Tokyo 1350062, Japan
[3] Reg Res Lab, Bhubaneswar 751013, Orissa, India
来源：
APPLIED PHYSICS LETTERS | 2001年 / 78卷 / 11期
关键词：
D O I：
10.1063/1.1354659
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report significant enhancement of magnetoresistance (MR) in melt-processed La0.67Ca0.33MnO3 (LCM) and in Ho-doped LCM samples. The LCM system exhibits surprising enhancement of metal-insulator transition (T-IM) that coincides with the Curie transition temperature (T-c), T-IM approximate to T-c, illustrating the enhanced percolative transport and spin-polarization through grain boundaries. Surprisingly, 1 mol % of addition of Ho enhances T-c of similar to 70 K with remarkable colossal MR. The nanoscale Ho distribution is consistent with the magnetic inhomogeneity-induced MR due to phase segregation in Ho-doped sample whereas charge-segregation picture is valid for undoped LCM. (C) 2001 American Institute of Physics.
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页码：1598 / 1600
页数：3
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