通过射频磁控溅射法在单晶LaAlO3(100)衬底上成功的生长了Nd0.67Pb0.33MnO3薄膜.用X射线衍射仪、超导量子干涉仪、直流四探针法对其结构及磁电特性进行了研究.结果表明,薄膜为赝立方钙钛矿结构,晶胞参数为a=3.846nm.居里温度为158K.在居里温度附近,发生铁磁-顺磁转变,导电特性由金属特征向半导体特征过渡.此材料呈现出一种典型的自旋玻璃特性,是由于应力造成的.磁电阻在居里点附近达到极大值,当H=1.0T时,磁电阻的极大值为28.5%.输运性质表明,T＜TMI时,电阻率满足公式:ρ(T)=ρ0 +ρ1T2+ρ2T5此输运机制是由电子散射造成的;当T＞TMI时,符合小极化子模型,输运机制是由于小极化子近邻跃迁引起的.
参考文献
| [1] | Helmolt R Von;Wecker J;Holzapfel B et al.[J].Physical Review Letters,1993,71:2331. |
| [2] | Ramirez A P .[J].Journal of Physics:Condensed Matter,1997,9:8171. |
| [3] | Zhang PX.;Zhang GY.;Habermeier HU.;Lee WK.;Wang JB. .Laser induced voltage in CMR thin films and its device application[J].Physica, C. Superconductivity and its applications,2001(0):656-658. |
| [4] | Tokura Y .Critical features of colossal magnetoresistive manganites[J].Reports on Progress in Physics,2006(3):797-851. |
| [5] | Gor'kov LP;Kresin VZ .Mixed-valence manganites: fundamentals and main properties[J].Physics Reports: A Review Section of Physics Letters (Section C),2004(3):149-208. |
| [6] | 江阔,李合非,宫声凯.应力对La0.83Sr0.17MnO3薄膜输运性能的影响[J].物理学报,2006(03):1435-1440. |
| [7] | 罗炳成,陈长乐,高国棉,金克新,韩立安.La0.9Sr0.1MnO3薄膜中电流效应研究[J].物理学报,2007(08):4920-4923. |
| [8] | Coey JMD.;von Molnar S.;Viret M. .Mixed-valence manganites [Review][J].Advances in physics,1999(2):167-293. |
| [9] | Ghosh;Nilotpal;Elizabeth et al.[J].Journal of Applied Physics,2004,96:3343. |
| [10] | Dagotto E;Hotta T;Moreo A .[J].Physics Reports,2001,344:46. |
| [11] | Rao R A;Lavric D .[J].Applied Physics Letters,1998,78:3924. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%