大学物理 ›› 2010, Vol. 29 ›› Issue (7): 55-55.

• 著者文摘 • 上一篇    下一篇

基于LabVIEW实时研究辐照效应对锰氧化物薄膜电阻的影响

杨爽 朱礼军 熊昌民 张仲秋 许成伟   

  1. 北京师范大学物理系,北京100875
  • 出版日期:2010-07-25 发布日期:2010-07-20

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

  • Online:2010-07-25 Published:2010-07-20

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1wt%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.

关键词: LabVIEW编程, 射线辐照, 钙钛矿锰氧化物, 电阻

Abstract: 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.

Key words: LabVIEW program, irradiation damage, perovskite manganite oxides, resistance

中图分类号: 

  • O484.42