| 학회 |
한국재료학회 |
| 학술대회 |
2004년 봄 (05/14 ~ 05/14, 강릉대학교) |
| 권호 |
10권 1호 |
| 발표분야 |
세라믹스 |
| 제목 |
LSMO/LMO 초격자의 구조 및 자기저항특성 연구 |
| 초록 |
The structural and magnetic transport properties of manganite-based superlattices were investigated using La0.67Sr0.33MnO3 (LSMO) and LaMnO3 (LMO) magnetic layers as stacking layers. All the superlattices were fabricated by employing laser-MBE method. The layer-by-layer growth of LSMO/LMO superlattices and their stacking periodicity were controlled by monitoring the RHEED pattern. Analysis of synchrotron XRD patterns indicated that the LSMO/LMO superlattices had well-defined structures. The superlattice patterns were compared with the calculated patterns based on the one-dimensional step model. Although the resistivity under various magnetic fields showed that all the superlattices exhibited metallic-to-insulating transitions (MIT) near Tc and were ferromagnetic, insulating behaviors appeared again at low temperatures for the superlattices having their stacking periodicity shorter than a certain critical value. We propose that under a certain critical thickness the t2g electron-rich ferromagnetic insulating phase becomes dominant, thereby showing only insulating behavior. Additionally, it is supported by some calculations using effective parallel resistor model. |
| 저자 |
Sangwoo Ryu1, Hyun M. Jang2, Jun S. Kim1, Young M. Kim2
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| 소속 |
1Department of Materials Science and Engineering, 2Pohang Univ. of Science and Technology |
| 키워드 |
LSMO; LMO; superlattice; magnetoresistivity
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| E-Mail |
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