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Structural, Magnetic, and Electron Transport Studies on Nanocrystalline Layered Manganite La1.2Ba1.8Mn2O7 System

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The structure property relationship for Ru doped La1.2Ba1.8Mn2−x Ru x O7 system has been studied systematically. The system crystallizes in the single-phase tetragonal structure with space group of I 4/mmm. The unit cell volume is found to increase with Ru doping. The sheet type microstructure could be seen in this system, which is important for anisotropic nature of layered structure. The crystallite size is found to be 25 nm indicating nanocrystalline nature of the system. Ferromagnetic to paramagnetic (T c) transition above the room temperature is observed in all except the highest doped Ru (x = 1.0) where the T c is 254 K using a.c. susceptibility measurement. The large values of magnetoresistance for the x = 0.0 sample at 10 K is found to be 57% and 64% at applied fields of 5 and 10 T, respectively.
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Document Type: Research Article

Publication date: 2007-03-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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