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27 April 2024 |
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Thickness-dependent Local Surface Electronic Structures of Homoepitaxial SrTiO3 Thin Films | | Takeo Ohsawa
; Katsuya Iwaya
; Ryota Shimizu
; Tomihiro Hashizume
; Taro Hitosugi
; | | Date: |
16 Apr 2010 | | Abstract: | We have investigated the atomically-resolved substrate and homoepitaxial thin
film surfaces of SrTiO3(001) using low-temperature scanning tunneling
microscopy/spectroscopy (STM/STS) combined with pulsed laser deposition (PLD).
It was found that annealing at 1000 oC in an oxygen partial pressure of 1*10-6
Torr, which is a typical annealing treatment for the preparation of SrTiO3
substrates, unexpectedly resulted in a disordered surface on an atomic scale.
In contrast, homoepitaxial SrTiO3 thin films grown on this disordered substrate
exhibited (2*2) surface reconstructions. The differential conductance spectra,
dI/dV in STS measurements, revealed a number of surface defects in a
10-unit-cell-thick SrTiO3 film, but much fewer in a 50-unit-cell-thick film.
These results indicate that the defect density in the film strongly depends on
the film thickness, suggesting non-uniform stoichiometry along the growth
direction. | | Source: | arXiv, 1004.2746 | | Services: | Forum | Review | PDF | Favorites | |
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