Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-08-13
Physics
Condensed Matter
Strongly Correlated Electrons
15 pages,4 figures. Solid state communications 132(2004)83-87
Scientific paper
10.1016/j.ssc.2004.07.029
The effect of grain size on structural, magnetic and transport properties in electron-doped manganites La0.9Te0.1MnO3 has been investigated. All samples show a rhombohedral structure with the space group at room temperature. It shows that the Mn-O-Mn bond angle decreases and the Mn-O bond length increases with the increase of grain size. All samples undergo paramagnetic (PM)-ferromagnetic (FM) phase transition and an interesting phenomenon that both magnetization and the Curie temperature decrease with increasing grain size is observed, which is suggested to mainly originate from the increase of the Mn-O bond length . Additionally, obviously increases with decreasing grain size due to the increase of both the height and width of tunneling barriers with decreasing the grain size. The results indicate that both the intrinsic colossal magnetoresistance (CMR) and the extrinsic the extrinsic interfacial magnetoresistance (IMR) can be effectively tuned in La0.9Te0.1MnO3 by changing grain size.
Ma Yan-Qing
Sheng Z. G.
Song Wei-Hong
Sun Ya-Ping
Yang Jaek-Jin
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