Tuning the phase separation in La0.325Pr0.3Ca0.375MnO3 using the electric double-layer field effect

Electric double-layer field effect experiments were performed on ultrathin films of La0.325Pr0.3Ca0.375MnO3, which is noted for its micrometer-scale phase separation. A clear change of resistance up to 220% was observed and the characteristic metal-insulator transition temperature Tp was also shifte...

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Published in中国物理B：英文版 no. 9; pp. 528 - 534
Main Author 崔丽敏 李洁 张玉 赵璐 邓辉 黄克强 李贺康 郑东宁
Format Journal Article
LanguageEnglish
Published 01.09.2014
Subjects
双电层
场效应
微米尺度
温度依赖性
相分离
调谐效应
转变温度
载流子密度
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Summary:Electric double-layer field effect experiments were performed on ultrathin films of La0.325Pr0.3Ca0.375MnO3, which is noted for its micrometer-scale phase separation. A clear change of resistance up to 220% was observed and the characteristic metal-insulator transition temperature Tp was also shifted. The changes of both the resistance and Tp, suggest that the electric field induced not only tuning of the carrier density but also rebalancing of the phase separation states. The change of the charge-ordered insulating phase fraction was estimated to be temperature dependent, and a maximum of 16% was achieved in the phase separation regime. This tuning effect was partially irreversible, which might be due to an oxygen vacancy migration that is driven by the huge applied electric field.
Bibliography:Electric double-layer field effect experiments were performed on ultrathin films of La0.325Pr0.3Ca0.375MnO3, which is noted for its micrometer-scale phase separation. A clear change of resistance up to 220% was observed and the characteristic metal-insulator transition temperature Tp was also shifted. The changes of both the resistance and Tp, suggest that the electric field induced not only tuning of the carrier density but also rebalancing of the phase separation states. The change of the charge-ordered insulating phase fraction was estimated to be temperature dependent, and a maximum of 16% was achieved in the phase separation regime. This tuning effect was partially irreversible, which might be due to an oxygen vacancy migration that is driven by the huge applied electric field.
Cui Li-Min, Li Jie, Zhang Yu, Zhao Lu, Deng Hui, Huang Ke-Qiang, Li He-Kang, Zheng Dong-Ning（ Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China）
11-5639/O4
electric double-layer field effect, manganites, phase separation
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/23/9/098501