采用溶胶-凝胶方法制备了系列样品La0.75Sr0.25-xKxMnO3(x=0.00,0.05,0.07,0.10).对系列样品进行了相结构、磁性和电输运性质的研究.XRD数据表明:系列样品具有完整的钙钛矿锰氧化物结构.通过对磁性和电阻率的研究发现:与双交换作用相比,A位离子的无序度2对样品的磁性和电输运的影响起主要作用.随掺杂量的增加,磁电阻的峰值逐渐增大;峰值温度逐渐下降,更接近室温.在210～280 K的温区内,磁电阻基本保持稳定.这些结果都有利于磁电阻的实际应用.
参考文献
| [1] | Ziese M..Extrinsic magnetotransport phenomena in ferromagnetic oxides [Review][J].Reports on Progress in Physics,20022(2):143-249. |
| [2] | PENG Zhensheng;WANG Guiying;TANG Yonggang;LIU Peng;NIU Xiaofei.Enhancement of room-temperature magnetoresistance in La_(0.5)Sm_(0.2)Sr_(0.3)MnO_3/(Ag_2O)_(x/2)[J].稀有金属（英文版）,2010(01):45-49. |
| [3] | SONG Qixiang;NIU Xiaofei;WANG Guiying;TANG Yonggang;CAI Zhirang;PENG Zhensheng.Enhancement of room-temperature magnetoresistance in La_(0.6)Dy_(0.1)Sr_(0.3)MnO_3/Ag_x[J].稀有金属(英文版),2010(02):126-131. |
| [4] | G. D. Tang;D. L. Hou;W. Chen;P. Hao;G. H. Liu;S. P. Liu;X. L. Zhang;L. Q. Xu.Estimation of Mn~(4+) ion content ratio in self-doped compound La_(1－x)MnO_(3-δ)[J].Applied physics letters,200715(15):152503.1-152503.3. |
| [5] | 刘俊明;王克锋.稀土掺杂锰氧化物庞磁电阻效应[J].物理学进展,2005(1):82-130. |
| [6] | Sahana M;Singh RN;Shivakumara C;Vasanthacharya NY;Hegde MS;Subramanian S;Prasad V;Subramanyam SV;INDIAN INST SCI DEPT PHYS BANGALORE 560012 KARNATAKA INDIA..Colossal magnetoresistance in epitaxial La(1-x-y)NayMnO3 thin film[J].Applied physics letters,199721(21):2909-2911. |
| [7] | 户立春.固相反应法制备La0.6Sr0.25K0.15MnO3+xAg复合材料及其磁电阻效应研究[J].硅酸盐通报,2014(4):895-899. |
| [8] | J. B. Goodenough.Colossal Magnetoresistance in Ln_(1-x)A_xMnO_3 Perovskites[J].Australian Journal of Physics,19992(2):155-186. |
| [9] | 唐永刚;严国清;毛强;郭焕银;彭振生;刘宁.一价Na元素对LaMnO3母体A位掺杂的磁电性质的影响[J].低温物理学报,2008(1):43-48. |
| [10] | 王闻琦;严国清;杨杰;王桂英;唐永刚;宋启祥;张明玉;彭振生.La1-x（Sr1-yKy）xMnO3的电输运性质及磁电阻的温度稳定性[J].硅酸盐学报,2011(12):1958-1962. |
| [11] | 陈永虔;谷坤明;唐涛;崔旭高;张世远.掺K+和Ag+的LaMnO3的室温庞磁电阻效应[J].磁性材料及器件,2001(3):9-13. |
| [12] | Rodriguez-Martinez LM.;Attfield JP..Cation disorder and the metal-insulator transition temperature in manganese oxide perovskites[J].Physical Review.B.Condensed Matter,19985(5):2426-2429. |
| [13] | 毛强;王桂英;彭振生.Dy离子La位替代对La0.7Sr0.3CoO3磁性质的影响[J].低温物理学报,2010(5):364-369. |
| [14] | WANG Guiying;YAN Guoqing;YANG Jie;WANG Wenqi;TANG Yonggang;SONG Qixiang;ZHANG Mingyu;PENG Zhensheng.Magnetoresistance enhancement and temperature stability of magnetoresistance in La1-x(Sr1-yNay)xMnO3[J].稀有金属（英文版）,2012(04):387-391. |
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