Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10653230 | Solid State Communications | 2005 | 6 Pages |
Abstract
We have synthesized several polycrystalline samples with nominal compositions La0.7Sr0.3âxHgxMnO3+δ (0â¤xâ¤0.2) by the standard solid-state reaction method. Instead of the sealed quartz tube method widely employed for the Hg-based systems, we adopted open atmosphere synthesis route. All the samples exhibited monophasic nature with rhombohedral structure as revealed by the X-ray diffraction data. A variation in the unit cell volume is observed with x, which is interpreted as a result of extra oxygen in-diffusion and subsequent cation vacancy creation. A broad metallic behavior is seen in the entire temperature range from 300 to 4 K. The samples showed varying amount of colossal magnetoresistance depending upon the temperature and applied magnetic field. The MR value as high as 30% was observed in x=0.2 sample and the MR is persistent over a wide temperature range with a little change in magnitude.
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Vilas Shelke, Subhash Khatarkar, Rajiv Rawat, R.K. Singh,