| La0.67Sr0.33-xAgxMnO3的室温磁电阻效应 |
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| 引用本文： | 唐贵德,刘兴民,刘力虎,赵旭,白一鸣,潘成福,侯登录,余勇,禹日成,靳常青. La0.67Sr0.33-xAgxMnO3的室温磁电阻效应[J]. 功能材料, 2004, 35(4): 434-436 |
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| 作者姓名： | 唐贵德 刘兴民 刘力虎 赵旭 白一鸣 潘成福 侯登录 余勇 禹日成 靳常青 |
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| 作者单位： | 河北师范大学,物理学院,河北,石家庄,050016;中国科学院物理研究所,北京,100080 |
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| 基金项目： | 国家自然科学基金资助项目(10074013) |
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| 摘 要： | 采用溶胶-凝胶(sol-gel)法制备了名义组分为La0.67Sr0.33-xAgrMnO3(x=0.15、0．20)的多晶样品，发现用Ag部分替代Sr后样品的室温磁电阻比替代前明显增大。在1．8T下，La0．67Sr0.18Ag0.15MnO3样品的磁电阻在330K出现峰值,其峰值为35％；对于La0．67Sr0.13Ag0.2 MnO3样品，磁电阻峰值为26％．且峰的宽度较大，在290～315K之间的磁电阻随着温度变化不大．因此显著提高了室温时样品的磁电阻和磁电阻的温度稳定性，另外．还提高了样品的磁场灵敏度。这对磁电阻的应用有很大意义。
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| 关 键 词： | 磁电阻效应 锰氧化物 钙钛矿结构 溶胶-凝胶法 |
| 文章编号： | 1001-9731(2004)04-0434-03 |
| 修稿时间： | 2003-09-25 |
Room temperature magnetoresistance effect of La0.67 Sr0.33-xAgxMnO3 |
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| TANG Gui-de,LIU Xing-min,LIU Li-hu,ZHAO Xu,BAI Yi-ming,PAN Cheng-fu,HOU Deng-lu,YU Yong,YU Ri-cheng,JIN Chang-qing. Room temperature magnetoresistance effect of La0.67 Sr0.33-xAgxMnO3[J]. Journal of Functional Materials, 2004, 35(4): 434-436 |
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| Authors: | TANG Gui-de LIU Xing-min LIU Li-hu ZHAO Xu BAI Yi-ming PAN Cheng-fu HOU Deng-lu YU Yong YU Ri-cheng JIN Chang-qing |
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| Affiliation: | TANG Gui-de~1,LIU Xing-min~1,LIU Li-hu~1,ZHAO Xu~1,BAI Yi-ming~1,PAN Cheng-fu~1,HOU Deng-lu~1,YU Yong~2,YU Ri-cheng~2,JIN Chang-qing~2 |
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| Abstract: | La_(0.67)Sr_(0.33-x)Ag_xMnO_3 polycrystalline sample were synthesized by sol-gel method. It is found that the room temperature magnetoresistance of this kind material was obviously larger than La_(0.67)Sr_(0.33)MnO_3. Under an applied filed of 1.8T, there was a MR maximum 35% of La_(0.67)Sr_(0.18)Ag_(0.15)MnO_3 at 330K; and a MR maximum 26% of La_(0.67)Sr_(0.13)Ag_(0.20)MnO_3 at 300K. Comparing with La_(0.67)Sr_(0.33)MnO_3, not only the MR value of the sample La_(0.67)Sr_(0.13)Ag_(0.2)MnO_3 was increased but also temperature stability of magentoresistance was improved at room temperature range, moreover field susceptivity was also highly improved, which was important for the application of this magnetoresistance material. |
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| Keywords: | magnetoresistance effect Mn-oxides perovskite type structure sol-gel method |
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