研究了La位Dy掺杂对La0.7-xDyxSr0.3MnO3(x=0.00、0.10、0.15、0.20、0.30、0.40、0.50、0.60、0.70)体系输运行为的影响.实验结果表明:随Dy掺杂的增加, 体系由长程铁磁有序向自旋团簇玻璃态、反铁磁状态转变.高掺杂时的输运性质在其磁背景下发生异常,在x=0.50时,发现了在ABO3结构中很少出现过的在Tc附近发生绝缘体-金属相变之后又发生从金属-绝缘体相变的现象;对x=0.60、0.70,在远离Tc的温区体系表现为绝缘体.
The influence of Dy doping at La-site on transport properties of La0.7-xDyxSr0.3MnO3
(x=0.00, 0.10, 0.15, 0.20, 0.30, 0.40, 0.50, 0.60, and 0.70) was studied. The experimental results indicate that with increasing Dy doping, the system
undergoes a transition from long range ferromagnetic order to the cluster-spin glass state and further to antiferromagnetic order. The transport properties
exhibit abnormal behaviour at high doping condition. For x=0.50, a transition from metal to insulator occurs after the occurrence of
insulator-metal transition near Tc, which seldom occurs in ABO3 structure. The samples of x=0.60 and 0.70, exhibit insulator behavior far
above Tc.
参考文献
| [1] | Helmolt R V, Wecker J, Holzapfel B, et al. Phys Rev Lett, 1993, 71: 2331--2333. [2] Jin S, Tiefel T H, McCormack M, et al. Science, 1994, 264: 413--415. [3] Xiong G C, et al. Appl Phys Lett, 1995, 66: 1427--1429. [4] Zener C. Phys Rev, 1951, 82: 403--409. [5] Millis J, Littlewood P B, Shraiman B I. Phys Rev Lett, 1995, 74: 5144--5147. [6] Hwang H Y, Cheong S-W, Radaelli P G. Phys Rev Lett, 1995, 77: 914--917. [7] Zhou J-S, Goodenough J B. Phys Rev Lett, 1998, 80: 2665--2668. [8] Moreo A, Yunoki S, Dagotto E. Sciencn, 1999, 283: 2034--2040. [9] Fath M, Freisem S, Menovsky A A, et al. Science, 1999, 285: 1540--1542. [10] Uehara M, Mori S, Chen C H, et al. Nature, 1999, 399: 560--563. [11] Liu N, Sun Y, Zhang Y H. China Phys Lett, 2001, 7: 957--959. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%