Cross-sectional scanning tunneling microscopy for complex oxide interfaces

TeYu Chien; Nathan P. Guisinger; John W. Freeland

doi:10.1117/12.879329

14 March 2011 Cross-sectional scanning tunneling microscopy for complex oxide interfaces

TeYu Chien, Nathan P. Guisinger, John W. Freeland

Proceedings Volume 7940, Oxide-based Materials and Devices II; 79400T (2011) https://doi.org/10.1117/12.879329
Event: SPIE OPTO, 2011, San Francisco, California, United States

Abstract

Cross-sectional scanning tunneling microscopy (XSTM) is developed for studying the interfaces of the complex oxide heterostructures. Since most of the complex oxide materials have a perovskite structure, which does not have cleavage plane, it posed an experimental challenge for utilizing STM on the fractured surfaces. A well-controlled method for fracturing non-cleavable materials was developed by using the common subtrate: Nb-doped SrTiO₃ (Nb:STO). Through systematically studies on the control of the fracturing conditions, on the tip-sample interactions and on the resulting fractured surfaces of Nb:STO, atomic flat terraces are routinely created and stable measurements are achieved. By harnessing the well-controlled fracturing method and the well-controlled tip conditions to a thin film system, La_2/3Ca_1/3MnO₃/Nb:STO (LCMO/Nb:STO), XSTM as well as the ability of cross-sectional scanning tunneling spectroscopy (XSTS) directly revealed the band diagram mapping across the interface. The novel developed, well-controlled XSTM/S for the interfaces of complex oxide heterostructures opened a door for accurate determination of local electronic properties across and at the interface.

Citation Download Citation

TeYu Chien, Nathan P. Guisinger, and John W. Freeland "Cross-sectional scanning tunneling microscopy for complex oxide interfaces", Proc. SPIE 7940, Oxide-based Materials and Devices II, 79400T (14 March 2011); https://doi.org/10.1117/12.879329

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