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Browse Journals & Magazines > Applied Physics Letters ...> Volume:90 Issue:25 Help

Fermi level shift in La1-xSrxMO3 (M=Mn, Fe, Co, and Ni) probed by Schottky-like heteroepitaxial junctions with SrTi0.99Nb0.01O3

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7 Author(s)
Sawa, A. ; Correlated Electron Research Center (CERC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8562, Japan ; Yamamoto, A. ; Yamada, H. ; Fujii, T.
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The authors have studied electrical properties of perovskite heteroepitaxial junctions consisting of transition metal oxides La1-xSrxMO3 (LSMO: M=Mn, Fe, Co, and Ni) and an n-type semiconductor SrTi0.99Nb0.01O3 (Nb:STO). The junctions showed rectifying current-voltage characteristics that could be analyzed by taking into account a Schottky-like barrier formed in the Nb:STO at the interfaces. As the doping level x is increased, the Schottky barrier height and built-in potential increase as ∼x (eV), indicating the downward shift of the Fermi level position in the LSMO. The Fermi level position in the LSMO with the same doping level x tends to be deepened with increasing the atomic number of M, in the order of Mn, Fe, Co, and Ni.

Published in:
Applied Physics Letters  (Volume:90 ,  Issue: 25 )

Date of Publication: Jun 2007

Page(s):
252102 - 252102-3
ISSN :
0003-6951
Digital Object Identifier :
10.1063/1.2749431
Product Type:
Journals & Magazines
Date of Current Version :
18 June 2009
Issue Date :
Jun 2007

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