La0.67Ca0.33MnO3(001)薄膜表面结构的扫描隧道显微术研究

刘锴; 王兵

doi:10.7498/aps.60.046801

摘要

利用Scanning Tunneling Microscope(STM)和Scanning Tunneling Spectroscopy(STS)技术研究了La0.67Ca0.33MnO3(001)表面性质,研究发现表面呈现多相分离现象,在锰氧终端面观察到了绝缘性的( 2 × 2 )R45°重构表面和金属性的(1×1)重构表面,在镧钙氧终端面,观察到了表面呈现条纹状结构.La0.67Ca0.33

关键词:

La0.67Ca0.33MnO3(001) thin films have been grown with pulsed laser deposition method, and the surface structures and electronic states have been characterized using scanning tunneling microscopy/spectroscopy (STM/STS). In the Mn-O terminated surface, insulating ( 2 × 2 )R45° reconstruction surface and metallic (1×1) reconstruction surface are observed. In the (La,Ca)-O terminated surface, the surface presents the stripe structure. The results obtained from the variable temperature STM/STS show that the ( 2 × 2 )R45° reconstructed surface persists in insulating phase in a temperature range of 144—300 K, which may shield the signal of possible insulator-metal transition occurred in bulk in STS measurements.

Keywords:

作者及机构信息

刘锴,
王兵

1.
中国科学技术大学,合肥微尺度物质科学国家实验室,合肥 230026

基金项目: 国家自然科学基金(批准号: 60771006)资助的课题.

Authors and contacts

Liu Kai,
Wang Bing

1.
Hefei National Laboratory for Physical Sciences at the Microscale, Universityof Science and Technology of China, Hefei 230026, China

参考文献

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施引文献

[1]	Jin S, Tiefel T H, McCormack M, Fastnacht R A, Ramesh R, Chen L H 1994 Science 264 413
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[5]	Renner C, Aeppli G, Kim B G, Soh Y A, Cheong S W 2002 Nature 416 518
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[14]	Lu Q Y 1997 Science 276 2006
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[27]	Kawasaki M 1994 Science 266 1540
[28]	Weil J Y T, Yehl N C, Vasquez R P 1997 Phys. Rev. Lett. 79 5150
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