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American Institute of Physics, Applied Physics Letters, 12(106), p. 121601, 2015

DOI: 10.1063/1.4916225

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Insulating-layer formation of metallic LaNiO3 on Nb-doped SrTiO3 substrate

Journal article published in 2015 by Hyang Keun Yoo, Young Jun Chang ORCID, Luca Moreschini, Hyeong-Do Kim ORCID, Chang Hee Sohn, Soobin Sinn, Ji Seop Oh, Cheng-Tai Kuo, Aaron Bostwick, Eli Rotenberg, Tae Won Noh
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This paper is available in a repository.

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Abstract

We investigated the electronic structures of strongly correlated metallic LaNiO3 (LNO) and semiconducting Nb-doped SrTiO3 (Nb:STO) heterostructures by varying the LNO film thickness using in situ photoemission spectroscopy. We found that, contrary to other interfaces with SrTiO3 and LaAlO3, insulating LNO layers are formed between metallic LNO layers and Nb:STO. Such behavior seems to be related with an electron transfer from Nb:STO to LNO due to Schottky-barrier formation at the interface. (C) 2015 AIP Publishing LLC.