Wide range magnetoresistance and high temperature coefficient of resistance in La0.7Sr0.3−xAgxMnO3 system
Wide range magnetoresistance and high temperature coefficient of resistance in La0.7Sr0.3−xAgxMnO3 system
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DOI：
10.1007/s10854-010-0280-y
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发表时间：
2011-01
期刊：
影响因子：
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通讯作者：
R. Yadav;A. Anshul;V. Shelke
中科院分区：
文献类型：
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作者：
R. Yadav;A. Anshul;V. Shelke
本文报道了在La0.7Sr0.3− xAgxMnO 3（0 ≤ x ≤ 0.3）系统中观察到的与组分和工艺参数有关的宽范围磁电阻和高电阻温度系数。固相反应法合成的多晶样品具有菱面体结构，晶格参数发生了系统的变化。x ≤ 0.2的样品在室温以下表现出金属行为。当x = 0.3时，观察到一个宽的金属-绝缘体转变，这在高温烧结的样品中变得尖锐。宽转变导致在宽温度范围内的磁阻（MR）值约35%，而急剧转变导致MR值高达85%。11%的电阻值的温度系数被视为急剧转变的结果。高温烧结样品的磁转变明显。
We report observation of composition and process parameter dependant wide range magnetoresistance and high temperature coefficient of resistance in La0.7Sr0.3−xAgxMnO3(0 ≤ x ≤ 0.3) system. The polycrystalline samples synthesized through solid state reaction method exhibited rhombohedral structure with systematic change in lattice parameters. The samples with x ≤ 0.2 showed metallic behavior below room temperature. A broad metal-insulator transition is observed for x = 0.3, which becomes sharp for the samples sintered at high temperature. The broad transition resulted in magnetoresistance (MR) value around 35% over a wide temperature range whereas the sharp transition results in MR value as high as 85%. The temperature coefficient of resistance value of 11% is seen as a consequence of sharp transition. The magnetic transition was sharp for the samples sintered at high temperature.