Size effect of substitutional alkaline-earth elements on the electrical and structural properties of LaMnO3 films

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概要

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• Tolerance factor controlled Mn-based colossal magnetoresistance (CMR) thin films (La0.7Ca0.3MnO3, La0.7Sr0.3MnO3, La0.7Sr0.11Ba0.19MnO3, and La0.7Ba0.3MnO3) which have the same content of divalent cation and Mn3+/Mn4+ ratio were deposited on amorphous SiO2/Si substrate by rf magnetron sputtering at 350°C substrate temperature. Post annealing treatment for 1 h at 600°C was also carried out to investigate the effects of internal strain and chemical bonding nature from different divalent ions on the electrical properties of the films by maintaining a similar crystalline state. The films crystallized with pseudo cubic structure in spite of different tolerance factors. The sheet resistance of films changed according to crystallization and Mn-O bonding character. Mn L-edge X-ray absorption spectra revealed that Mn3+/Mn4+ ratio did not change in all the films and Mn 2p core level X-ray photoelectron spectra showed that Mn-O bonding property changed to more covalence as increasing tolerance factor by substitution with larger size divalent cation. O K-edge X-ray absorption spectra observed t2g and eg electron states and low resistivity after post anneal could be explained by the promotion of electrons to low binding energy state. Temperature coefficient of resistance (TCR) values were about -2.24 ∼ -2.57%/K of as deposited CMR films and these values were reasonable for uncooled microbolometer applications.

• 公益社団法人 日本セラミックス協会の論文

著者

• Choi Sun

  Department Of Medical Research Korea Institute Of Oriental Medicine

• Choi Sun

  Department Of Biomedical Laboratory Science College Of Biomedical Science And Engineering Inje Unive

• PARK Hyung-Ho

  Department of Ceramic Engineering, Yonsei University

• KWON Kwang-Ho

  Department of Electronic Engineering, Hanseo Unviersity

• A. Sivasankar

  Department of Materials Science and Engineering, Yonsei University

• Wang Seok-Joo

  Department of Materials Science and Engineering, Yonsei University

• HONG MunPyo

  Department of Display and Semiconductor Physics, Korea University

• Wang Seok-joo

  Department Of Ceramic Engineering Yonsei University

• Park Hyung-ho

  Department Of Ceramic Engineering Yonsei University

• Kwon Kwang-ho

  Department Of Electronic Engineering Hanseo University

• REDDY A.

  Department of Materials Science and Engineering, Yonsei University

• Reddy A.

  Department Of Biology And Program In Molecular Plant Biology Colorado State University

• CHOI Sun

  Department of Materials Science and Engineering, Yonsei University

• KWON Kwang-Ho

  Department of Control and Instrumentation Engineering, Korea University

• Hong Munpyo

  Department of Applied Physics, Korea University, Seoul 136-713, Korea

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