Memory Effect in Thin Thermocycling-modified La0.67Ca0.33MnO3 Films

被引:0
|
作者
Anisimovas, Fiodoras [1 ]
Asmontas, Steponas [1 ]
Gradauskas, Jonas [1 ]
Kiprijanovic, Oleg [1 ]
Vengalis, Bonifacas [1 ]
机构
[1] Ctr Phys Sci & Technol, LT-01108 Vilnius, Lithuania
来源
MATERIALS SCIENCE-MEDZIAGOTYRA | 2012年 / 18卷 / 01期
关键词
manganite thin films; thermocycling; highly resistive states; martensitic-type transformations; memory effect;
D O I
10.5755/j01.ms.18.1.1333
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Nonhomogeneous thin La0.67Ca0.33MnO3 films, having T-m in 180 K - 200 K temperature range, were thermocycled between 80 K and 210 K using liquid nitrogen. After the thermocycling it was confirmed formation of highly resistive state with additional low temperature peak of resistance with maximum at 115 K when measuring R-T plots. Measurements of electroresistive effect in this state using low dc of different values and performed in cooling run reveal discontinuities of R-T plots. It is proposed formation of two different high resistive states: at low temperatures and at vicinity of T-m. The discontinuities disclose switching between these two states initiated by substrate-induced long-range strain and by manifestation of memory effect. This interpretation of experimental results explains appearing of low temperature peak based on influence of the long-range strains on formation of high resistive interlayers in the film during the thermocycling. We argue that the interlayers acquire memory properties after being modified by martensitic-type transformations.
引用
收藏
页码:8 / 11
页数:4
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