| La1/3Sr2/3Mn1-xFexO3(x=0,0.05)中电荷有序现象的超声研究 |
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| 引用本文： | 孔辉,谢津桥,张士龙,苏金瑞,朱长飞. La1/3Sr2/3Mn1-xFexO3(x=0,0.05)中电荷有序现象的超声研究[J]. 金属学报, 2003, 39(11): 1183-1185 |
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| 作者姓名： | 孔辉 谢津桥 张士龙 苏金瑞 朱长飞 |
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| 作者单位： | 中国科学技术大学材料科学与工程系内耗与固体缺陷实验室,合肥,230026;中国科学技术大学材料科学与工程系内耗与固体缺陷实验室,合肥,230026;中国科学技术大学材料科学与工程系内耗与固体缺陷实验室,合肥,230026;中国科学技术大学材料科学与工程系内耗与固体缺陷实验室,合肥,230026;中国科学技术大学材料科学与工程系内耗与固体缺陷实验室,合肥,230026 |
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| 基金项目： | 国家自然科学基金资助项目10274075 |
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| 摘 要： | 系统研究了La1／3Sr2／3Mn1-xFexO3(x=0，0．05)单相多晶样品在20--300K温区内的电荷输运性质和超声特性，结果表明，La1／3Sr2／3MnO3样品在235K存在明显的电荷有序现象，但是极少量的Fe取代Mn就会有效地抑制电荷有序现象的发生，伴随电荷有序现象的发生声速出现极大的软化，其相对变化超过5％，这表明La1／3Sr2／3Mn1-xFexO3中存在剧烈的电-声子相互作用，分析指出该电-声子耦合主要起源于Jahn-Teller效应。
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| 关 键 词： | La1/3Sr2/3Mn1-xFexO3 电荷有序 超声声速 |
| 文章编号： | 0412-1961(2003)11-1183-03 |
| 修稿时间： | 2003-07-09 |
ULTRASONIC STUDY OF La1/3Sr2/3Mn1-xFexO3 (x=0, 0.05) |
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| KONG Hui,XIE Jinqiao,ZHANG Shilong,SU Jinrui,ZHU ChangfeiLaboratory of Internal Friction and Defects in Solids. ULTRASONIC STUDY OF La1/3Sr2/3Mn1-xFexO3 (x=0, 0.05)[J]. Acta Metallurgica Sinica, 2003, 39(11): 1183-1185 |
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| Authors: | KONG Hui XIE Jinqiao ZHANG Shilong SU Jinrui ZHU ChangfeiLaboratory of Internal Friction Defects in Solids |
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| Affiliation: | KONG Hui,XIE Jinqiao,ZHANG Shilong,SU Jinrui,ZHU ChangfeiLaboratory of Internal Friction and Defects in Solids,Department of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026 |
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| Abstract: | The longitudinal ultrasonic velocity and resistance of single phase polycrystalline La1/3Sr2/3Mn1-xFexO3(a= 0, 0.05) samples were systematically measured from 20 K to 300 K. A charge ordering feature was observed near 235 K in the temperature dependent resistivity curve for La1/3Sr2/3MnO3, and strongly suppressed by the doping of Fe ion. It was also found that the ultrasonic velocity shows a dramatic softening around the charge ordering temperature. The relative change of sound velocity is larger than 5%, which implied the existence of strong electron-phonon interaction in La1/3Sr2/3Mn1-xFexO3 which originats from Jahn-Teller effect. |
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| Keywords: | La1/3Sr2/3Mn1-xFexO3 charge ordering ultrasonic velocity |
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