Two-current spin-dependent conduction in polycrystalline LaMnO{sub 3} produced under oxygen gas flow
- Department of Physics, Konan University, Kobe (Japan)
- Department of Physics, Osaka University, Osaka (Japan)
- National Institute of Advanced Industrial Science and Technology, Tsukuba (Japan)
We have studied two-current spin-dependent conduction in polycrystalline LaMnO{sub 3} (LMO) produced under the oxygen gas flow (OGF). The polycrystalline La{sub 1−x}Sr{sub x}MnO{sub 3} (LSMO) samples were prepared with x = 0, 0.1, 0.125, 0.15, 0.175, 0.2 by use of a solid-state-reaction method. The LMO sample produced under the OGF showed large electrical conduction due to the self-hole-doping caused by the excess oxygen ions in it. The electrical resistivity and magnetoresistance (MR) of the LSMO samples were measured as a function of temperature (4K-300K). With increasing the temperature, we have observed that the MR ratios of the LSMO samples with x ≠ 0 have one maximum, while that of LMO sample has two maxima. The temperature at the maximum of the MR ratio corresponds to the magnetic phase transition temperature. The existence of two MR maxima for the LMO sample is considered to imply that the LMO sample has two regions with different doping levels; the one is the crystalline grain region with low doping and the other is the amorphous-like grain-boundary region with high doping.
- OSTI ID:
- 22261844
- Journal Information:
- AIP Conference Proceedings, Vol. 1566, Issue 1; Conference: ICPS 2012: 31. international conference on the physics of semiconductors, Zurich (Switzerland), 29 Jul - 3 Aug 2012; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Spin transport in epitaxial magnetic manganite/ruthenate heterostructures with an LaMnO{sub 3} layer
Oxygen Transport Ceramic Membranes