| 钙钛矿(La1-yTby)0.67Sr0.33MnO3的超巨磁电阻效应 |
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| 引用本文： | 吴 坚,曹庆琪,谷坤明,李启亮,王 亮,张鸿才,都有为,张世远.钙钛矿(La1-yTby)0.67Sr0.33MnO3的超巨磁电阻效应[J].物理学报,1999,48(2):370-377. |
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| 作者姓名： | 吴 坚 曹庆琪 谷坤明 李启亮 王 亮 张鸿才 都有为 张世远 |
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| 作者单位： | 南京大学物理系，南京大学固体微结构物理国家重点实验室，南京 210093 |
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| 基金项目： | 国家科学技术委员会攀登计划《纳米材料科学》和国家自然科学基金(批准号：19974032)资助的课题. |
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| 摘 要： | 采用固相反应烧结法制成了钙钛矿(La1-yTby)0.67Sr0.33MnO3(y=0—1)多晶样品.研究了样品的微观结构，常温、低温下的磁性，样品的磁电阻随温度、成分的变化关系，电阻随温度变化特性等.并在y=0.40样品中，170K附近、最大磁化场为7T时，观察到了900%的巨磁电阻.
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| 关 键 词： | 钙钛矿型 锰氧化物 超巨磁电阻效应 |
| 收稿时间： | 1998-07-24 |
THE COLOSSAL MAGNETORESISTANCE OF (La1-yTby)2/3Sr1/3MnO3 PEROVSKITE |
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| WU JIAN,CAO QING-QI,GU KUN-MING,LI QI-LIANG,WANG LIANG,ZHANG HONG-CAI,DU YOU-WEI and ZHANG SHI-YUAN.THE COLOSSAL MAGNETORESISTANCE OF (La1-yTby)2/3Sr1/3MnO3 PEROVSKITE[J].Acta Physica Sinica,1999,48(2):370-377. |
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| Authors: | WU JIAN CAO QING-QI GU KUN-MING LI QI-LIANG WANG LIANG ZHANG HONG-CAI DU YOU-WEI and ZHANG SHI-YUAN |
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| Abstract: | A series of polycrystal bulk samples of (La1-yTby)2/3Sr1/3MnO3(x=0,0.05,0.15,0.20,0.25,0.33,0.4,0.5,0.6,1.0) have been prepared. Their microstructrues, magnetization M, resistance R as well as magnetoresistance (MR) have been systemically studied in the temperature range 10K≤T≤420K. The ferromagnetic transition temperature of the samples TC decrease with the increase y. For each sample, R have peak values at a temperature close to TC. The peak values of R increase rapidly with increasing y. At the sample (y=0.40), a colossal magnetoresistance up to 900% has been observed on the temperature 170K. |
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