| La1/8Ca7/8MnO3/Sr0.95Nb0.05TiO3异质结的整流特性和磁输运性质 |
| |
| 引用本文： | 王能语,周桃飞,李广.La1/8Ca7/8MnO3/Sr0.95Nb0.05TiO3异质结的整流特性和磁输运性质[J].低温物理学报,2007,29(2):149-152. |
| |
| 作者姓名： | 王能语 周桃飞 李广 |
| |
| 作者单位： | 中国科学技术大学物理系,合肥,230026 |
| |
| 摘 要： | 在5%Nb掺杂的SrTiO3衬底上用磁控溅射法外延生长了La1/aCa7/aMnO3薄膜形成异质结,该异质结有类似于传统P-n结的整流特性.磁场下扩散电压减小,当温度低于130 K以下,扩散电压的减小非常明显.这和在此温度以下,La1/8Ca7/aMnO3出现自旋倾斜态密切相关.我们计算出异质结的结电阻和磁致电阻(MR),在不同大小的正负偏压,不同磁场下,都得到负的MR值.我们给出界面附近的La1/8Ca7/8MnO3的能带结构并分析了外加磁场对洪德耦合,Jahn-Teller畸变等机制的作用,来解释该异质结的磁输运行为.结果有助于了解高Ca掺杂锰氧化物异质结的性质.
|
| 关 键 词： | 磁致电阻 异质结 |
| 修稿时间： | 12 25 2006 12:00AM |
RECTIFYING AND MAGNETORESISTANCE PROPERTIES OF THE HETEROJUNCTION COMPOSED OF La1/8 Ca7/8 MnO3 AND NB-DOPED SrTiO3 |
| |
| Wang Neng-yu,Zhou Tao-fei,Li Guang.RECTIFYING AND MAGNETORESISTANCE PROPERTIES OF THE HETEROJUNCTION COMPOSED OF La1/8 Ca7/8 MnO3 AND NB-DOPED SrTiO3[J].Chinese Journal of Low Temperature Physics,2007,29(2):149-152. |
| |
| Authors: | Wang Neng-yu Zhou Tao-fei Li Guang |
| |
| Institution: | 1.Department of Physics, University of Science and Technology of China, Hefei 230026;2.Department of Physics, University of Science and Technology of China, Hefei 230026;3.Department of Physics, University of Science and Technology of China, Hefei 230026 |
| |
| Abstract: | A heterojunction composed of La1/8 Ca7/8 MnO3 and Nb-doped SrTiO3 was fabricated, which shows rectifying characteristic like conventional p-n junctions. The diffusion voltage is slightly decreased under magnetic fields at high temperature and the effect of magnetic fields is more obvious at temperatures below 130 K, at which spin canting state appears in La1/8Ca7/8MnO3. A negative magnetoresistance was found in this heavily Ca-doped manganite heterojunction due to the majority spin carriers (MASCs) transport at the manganite-titanate interface. An energy band structure employing both Jahn-Teller distortion and Hund's coupling of electrons at the interface is used to explain the MASCs' magneto-transport behaviors. |
| |
| Keywords: | magnetoresistance heterojunction |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
