| La_(0.60)Sr_(0.40-x)K_xMnO_3系列材料的磁电阻效应 |
| |
| 引用本文： | 赵福伟,唐贵德.La_(0.60)Sr_(0.40-x)K_xMnO_3系列材料的磁电阻效应[J].材料科学与工程学报,2012,30(3):468-472. |
| |
| 作者姓名： | 赵福伟 唐贵德 |
| |
| 作者单位： | 1. 河北工程技术高等专科学校,河北沧州,061001
2. 河北师范大学物理科学与信息工程学院,河北石家庄,050024 |
| |
| 基金项目： | 河北省自然科学基金资助项目，河北省基础研究重点资助项目 |
| |
| 摘 要： | 利用溶胶-凝胶法(sol-gel)制备了多晶类钙钛矿型稀土锰氧化物La0.60Sr0.40-xKxMnO3(x=0.00,0.15,0.20,0.30)。发现K+取代部分Sr2+后,可使样品的居里温度降至室温附近,并且使样品的室温磁电阻比替代前明显增大。在1.8T的磁场下,x=0.30的样品磁电阻峰值为21%,相应的峰值温度为304K。而母体La0.60Sr0.40MnO3的磁电阻峰值仅为6.4%,峰值温度为373K。可见K+离子替代使室温附近样品的庞磁电阻效应有了明显的改善。
|
| 关 键 词： | 钙钛矿锰氧化物 磁电阻 溶胶-凝胶法 |
Magnetoresistance of La0.60Sr0.40-xKxMnO3 |
| |
| ZHAO Fu-wei,TANG Gui-de.Magnetoresistance of La0.60Sr0.40-xKxMnO3[J].Journal of Materials Science and Engineering,2012,30(3):468-472. |
| |
| Authors: | ZHAO Fu-wei TANG Gui-de |
| |
| Affiliation: | 1.Hebei Engineering and Technical College,Cangzhou 061001,China; 2.College of Physics and Information Engineering,Hebei Normal University,Shijiazhuang 050024,China) |
| |
| Abstract: | Polycrystalline perovskite rare-earth manganites La0.60Sr0.40-xKxMnO3(x=0.00,0.15,0.20,0.30) were synthesized by sol-gel method.It is found that when Sr2+ ions are partly substituted by K+ ions,the Curie temperature of substituted samples can decrease to room temperature and the room temperature magnetoresistance(MR) increases obviously comparing with un-substituted La0.60Sr0.40MnO3.Under an applied filed of 1.8T,there is a maximum MR with 21% at 304 K for the sample La0.60Sr0.1K0.3MnO3.However,under the same applied field,there is only a maximum MR with 6.4% at 373 K for the un-substituted sample La0.60Sr0.40MnO3.Therefore,K+ ion substitution can remarkably improve the MR of this kind of material. |
| |
| Keywords: | perovskite manganite magnetoresistance sol-gel method |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
