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Title
Japanese: 
English:Band-gap narrowing in α-(CrxFe1-x)2O3 solid-solution films 
Author
Japanese: 増子 尚徳, 大島 孝仁, 大友 明.  
English: H. Mashiko, T. Oshima, A. Ohtomo.  
Language English 
Journal/Book name
Japanese: 
English:Applied Physics Letters 
Volume, Number, Page Vol. 99        241904-1-3
Published date Dec. 13, 2011 
Publisher
Japanese:米国物理学会 
English:American Institute of Physics 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
File
Official URL http://scitation.aip.org/content/aip/journal/apl/99/24/10.1063/1.3669704
 
DOI https://doi.org/10.1063/1.3669704
Abstract We report on structural and optical properties for the (0001)-oriented α-(CrxFe1-x)2O3 (0 ≤ x ≤ 1) epitaxial films prepared on c-sapphire substrates by using pulsed-laser deposition. Pure corundum phase with atomically flat surface was obtained in the entire composition range. Optical absorption spectra for the films with 0.2 < x < 0.9 showed a nearly constant band-gap (1.7 eV), which is narrower than those of α-Fe2O3 (2.1 eV) and α-Cr2O3 (3.0 eV). The result suggests that the band-gap narrowing arises from a type-II band alignment of these oxides and the fundamental band-gap lies between the Cr t2g and O 2p occupied states and the Fe t2g* empty state.

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