Open atmosphere synthesis and wide range colossal magnetoresistance in La0.7Sr0.3−xHgxMnO3 (0≤x≤0.2) system |
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Authors: | Vilas Shelke Subhash Khatarkar RK Singh |
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Institution: | a Department of Physics, Novel Materials Research Laboratory, Barkatullah University, Bhopal 462 026, Madhya Pradesh, India b UGC-DAE Consortium for Scientific Research, DAV campus, Khandawa Road, Indore 452017, Madhya Pradesh, India |
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Abstract: | We have synthesized several polycrystalline samples with nominal compositions La0.7Sr0.3−xHgxMnO3+δ (0≤x≤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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Keywords: | 72 20 My 75 30Vn 81 40Rs |
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