Open AccessStudy of La0.67Ca0.33MnO3(001) thin film surfacestructure using scanning tunneling microscopy
Author(s) -
Kai Liu,
Bing Wang
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.046801
Subject(s) - scanning tunneling microscope , materials science , thin film , scanning tunneling spectroscopy , atmospheric temperature range , pulsed laser deposition , surface reconstruction , metal–insulator transition , spin polarized scanning tunneling microscopy , quantum tunnelling , variable range hopping , insulator (electricity) , condensed matter physics , spectroscopy , metal , analytical chemistry (journal) , nanotechnology , optoelectronics , surface (topology) , composite material , chemistry , metallurgy , physics , geometry , mathematics , chromatography , meteorology , thermal conduction , quantum mechanics
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.