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La0.67Ca0.33MnO3(001)薄膜表面结构的扫描隧道显微术研究

刘锴 王兵

La0.67Ca0.33MnO3(001)薄膜表面结构的扫描隧道显微术研究

刘锴, 王兵

Study of La0.67Ca0.33MnO3(001) thin film surfacestructure using scanning tunneling microscopy

Liu Kai, Wang Bing
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  • 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
    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.
      PACS:
    • 基金项目: 国家自然科学基金(批准号: 60771006)资助的课题.
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    [20]

    Ma J X, Gillapie D T, Plummer E W, Shen J 2005 Phys. Rev. Lett. 95 237210

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    Fuchiganmi K, Gai Z, Ward T Z, Yin L F, Snijders P C, Plummer E W, Shen J 2009 Phys. Rev. Lett. 102 066104

    [22]

    Rnnow H M, Renner C, Aeppli G, Kimura T, Tokura Y 2006 Nature 440 1025

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出版历程
  • 收稿日期:  2010-05-20
  • 修回日期:  2010-07-21
  • 刊出日期:  2011-02-05

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