基于LabVIEW实时研究辐照效应对锰氧化物薄膜电阻的影响  

Research on the electrical transport properties of manganite thin film under γ ray irradiation by using a real-time measurement system based on LabVIEW

作　　者：杨爽[1] 朱礼军[1] 熊昌民[1] 张仲秋[1] 许成伟[1] 

机构地区：[1]北京师范大学物理系,北京100875

出　　处：《大学物理》2010年第7期55-58,共4页College Physics

基　　金：北京师范大学本科生科研基金项目资助;教育部高等学校博士学科点专项科研基金新教师基金(200800271059)资助

摘　　要：基于LabVIEW编程开发出了一套自动电输运测量系统,并利用该自动测量系统实时测量了γ射线辐照对钙钛矿锰氧化物薄膜La0.67Ca0.33MnO3(LCMO)的电阻率的影响,结果发现LCMO薄膜电阻率在短时间辐照时降低,随着辐射时间增加,电阻率转而单调增加.在同等条件下还测量了1 wt%Nb掺杂SrTiO3(NSTO)的电阻的射线辐射效应,对比发现NSTO的电阻未出现明显变化.通过辐射损伤机理及锰氧化物的强关联电子特征对结果做出了解释.The electrical transport properties of La0.67 Ca0.33 MnO3 film under γ ray irradiation is studied by using a real-time measurement system based on LabVIEW program. It reveals some interesting phenomena： when the film is irradiated by gamma-ray, its resistance decreases at the begimfing but then increases obviously under the continuously long-time irradiation. For comparison, the influence of 3, ray irradiation on the resistance of 1 wt% Nb doped NSTO is also measured, which shows no distinct change as that in LCMO. A phenomenologieal explanation for the conductive behavior of LCMO films is proposed by taking into account the strongly electronic correlation feature and the irradiation damage mechanism in LCMO.

关 键 词：LABVIEW编程 射线辐照 钙钛矿锰氧化物 电阻 

分 类 号：O484.42[理学—固体物理]