我们研究了Mn位掺Cr体系La0.67Ca0.33Mn1-xCrxO3(0.0≤x≤0.15) 的磁性和磁电阻性质，发现Cr掺杂对居里温度Tc影响不明显，但是导致了反常的电输运和磁电阻行为，随着Cr含量的增加，起始电阻率峰向低温移动，同时电阻率出现一个附加峰.在磁场作用下，两个电阻率峰被强烈压缩，导致CMR效应中出现双峰，并且CMR效应的温区被极大地拓宽，从低温直到接近室温.这个结果表明：Mn位元素替代是调节CMR效应的有效方法.
We have studied the magnetic and magnetotransport properties of Mn-site doped system La0.67Ca0.33Mn1-xCrxO3 (0.0≤x≤0.15). It was found that the substitution with Cr on Mn sites is impotent in driving Tc, but introduces extraordinary transport and CMR behavior. With increasing Cr content, an additional bump of resistivity grows up drastically while the original resistivity peak associated with magnetic order transition diminishes gradually. Under applied magnetic field, both bumps of resistivity are deeply compressed, which leads to the appearance of two peaks in CMR response. As a result, the temperature range of CMR response is significantly broadened, from the lowest to near room temperature. These results suggest that Mn-site element substitution could be a potent way in tuning CMR response.
参考文献
| [1] | R von Helmolt;J Wecker;B Holzapfel;L Schultz,K Samwer .[J].Physical Review Letters,1993(71):2331. |
| [2] | S Jin;T H Tiefel;M McCormack .[J].Science,1994,264:413. |
| [3] | G C Xiong et al.[J].Applied Physics Letters,1995(66):1427. |
| [4] | C Zener .[J].Physical Review,1951(82):403. |
| [5] | J. Millis;P. B. Littlewood;B. I. Shraiman .[J].Physical Review Letters,1995(74):5144. |
| [6] | H Y Hwang;S-W Cheong;P G Radaelli .[J].Physical Review Letters,1995(77):914. |
| [7] | J -S Zhou;J B Goodenough .[J].Physical Review Letters,1998(80):2665. |
| [8] | Guo-meng Zhao;et al et al.[J].PHYSICAL REVIEW A,1996,77\676:381\5296. |
| [9] | J-W Cai;C Wang;B-G Shen .[J].Applied Physics Letters,1997(71):1727. |
| [10] | Maignan F Damay;A Barnabé;C Martin .[J].Philosophical Transactions of the Royal Society of London,1998,A356:1635. |
| [11] | Young Sun;Xiaojun Xu;Yuheng Zhang.[J].Applied Physics Letters |
| [12] | L.F. Cohen;P. S. I. P. N. de Silva;N. Malde .Reentrant metal-insulator-type transition induced by high fluence chromium ion implantation of La↓(0.7)Ca↓(03)MnO↓(3) thin films[J].Applied physics letters,1998(7/12):1005-1007. |
| [13] | B Raveau;A Maignan;C Martin .[J].Journal of Solid State Chemistry,1997,130:162. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%