| 名义成分为La1.0Ca2.0Mn2O7锰氧化物的压阻效应 |
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| 引用本文： | 朱嘉林,刘振兴,禹日成,李凤英,靳常青.名义成分为La1.0Ca2.0Mn2O7锰氧化物的压阻效应[J].高压物理学报,2006,20(3):230-236. |
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| 作者姓名： | 朱嘉林 刘振兴 禹日成 李凤英 靳常青 |
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| 作者单位： | 1. 中国科学院物理研究所极端条件实验室,中国科学院凝聚态物理中心,北京,100080;北京信息工程学院,北京,100101
2. 中国科学院物理研究所极端条件实验室,中国科学院凝聚态物理中心,北京,100080 |
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| 基金项目： | NationalNaturalScienceFoundationofChina(102740995032110150332020)，StateKeyDevel-opmentProgramforBasicResearchofChina(2002CB613301) |
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| 摘 要： | 利用低温高压电阻原位测量装置（自箝铍青铜活塞-圆筒式压砧），在0~1.05 GPa静水压力范围内，对以层状钙钛矿结构为主相、名义成分为La1.0Ca2.0Mn2O7的锰氧化物样品进行了压阻效应研究。实验观测到异常的压阻效应。在低温5~150 K范围内，压力为0.55 GPa时，样品呈现出高达40%的压阻效应，而且，金属-绝缘体相变温度在低压范围内随压力的增加而增加，但随着压力的进一步增加而减小。
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| 关 键 词： | 层状钙钛矿结构锰氧化物 电阻率 压阻效应 |
| 文章编号： | 1000-5773(2006)03-0230-07 |
| 收稿时间： | 2005-07-06; |
| 修稿时间： | 2005年7月6日 |
Pressure Effect on Electrical Properties of a Manganate with Nominal Composition La1.0Ca2.0Mn2O7 |
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| ZHU Jia-Lin,LIU Zhen-Xing,YU Ri-Cheng,LI Feng-Ying,JIN Chang-Qing.Pressure Effect on Electrical Properties of a Manganate with Nominal Composition La1.0Ca2.0Mn2O7[J].Chinese Journal of High Pressure Physics,2006,20(3):230-236. |
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| Authors: | ZHU Jia-Lin LIU Zhen-Xing YU Ri-Cheng LI Feng-Ying JIN Chang-Qing |
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| Institution: | 1. Institute of Physics, Center for Condensed Matter Physics, Beijing High Pressure Research Center, Chinese Academy of Sciences, Beijing 100080, China;2. Beijing Information Technology Institute, Beijing 100101, China |
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| Abstract: | Pressure effects on electrical properties of a manganate with nominal composition La1.0Ca2.0Mn2O7,which has a layered perovskite structure as majority phase,have been investigated under hydrostatic pressures up to 1.05GPa by using a self-clamped CuBe piston-cylinder cell.An abnormal pressure effect was observed.At a pressure of 0.55GPa,a large pressure resistance effect of ≈40% was observed in a lower temperature range of 5～150K.Besides,it is found that the metal-insulator transition temperature increases at low pressure but deceases with further loading pressure. |
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| Keywords: | layered perovskite manganate electrical resistivity pressure resistance effect |
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