| 학회 |
한국재료학회 |
| 학술대회 |
2014년 가을 (11/27 ~ 11/28, 대전컨벤션센터) |
| 권호 |
20권 2호 |
| 발표분야 |
A. 전자/반도체 재료(Electronic and Semiconductor Materials) |
| 제목 |
Tailoring of Electron-Phonon coupling in artificially designed superlattice |
| 초록 |
(La0.75Sr0.25VO3)2/(LaVO3)2n with n = 1, 2, 3, 4, and 5 superlattices were grown on stepped LaAlO3 (001) single crystal substrate using pulsed laser deposition method. The reflection high energy electron diffraction oscillations and atomic force microscopy images confirm two dimensional layer-by-layer growth in the films. Both DC and AC electrical properties of (La0.75Sr0.25VO3)2/(LaVO3)2n superlattices were investigated by 4-point probe method. The results demonstrate that electron-phonon coupling can be tuned by periodicity of artificial vanadate superlattice. By controlling V-O-V bond angle mismatch at interfaces between La0.75Sr0.25VO3 with little VO6 octahedron distortion and LaVO3 with larger distortion, we manipulate the strength of electron-phonon coupling. Our findings suggest a new way to control of their coupling in a situation that control over the coupling is still lacking despite marvelous advance in engineering nanostructures. |
| 저자 |
Minsu Choi1, HWANG TAEJUN2, TRAN M. Dao1, LEE Jaichan2
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| 소속 |
1School of Advanced Materials Science &Engineering, 2Sungkyunkwan Univ. |
| 키워드 |
LaVO3; Superlattice; local structure
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| E-Mail |
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