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Title: Two-current spin-dependent conduction in polycrystalline LaMnO{sub 3} produced under oxygen gas flow

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.
Authors:
;  [1] ;  [2] ; ; ;  [3]
  1. Department of Physics, Konan University, Kobe (Japan)
  2. Department of Physics, Osaka University, Osaka (Japan)
  3. National Institute of Advanced Industrial Science and Technology, Tsukuba (Japan)
Publication Date:
OSTI Identifier:
22261844
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1566; Journal 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)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; GAS FLOW; GRAIN BOUNDARIES; LANTHANUM COMPOUNDS; MAGNETORESISTANCE; MANGANATES; OXYGEN; OXYGEN IONS; PHASE TRANSFORMATIONS; POLYCRYSTALS; SOLIDS; SPIN; TEMPERATURE DEPENDENCE; TRANSITION TEMPERATURE