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arxiv 1710.00186 v1 pith:KGH5AJNJ submitted 2017-09-30 cond-mat.str-el cond-mat.mes-hall

Insulating-to-Conducting Behavior and Band Profile Across the La0.9Ba0.1MnO3/Nb:SrTiO3 Epitaxial Interface

Weiwei Li , Josee E. Kleibeuker , Rui Wu , Kelvin H. L. Zhang , Chao Yun , Judith L. MacManus-Driscoll This is my paper
classification cond-mat.str-el cond-mat.mes-hall
keywords mno3interfacebandsrtio3electronicfilmforminsulating-to-conducting
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La0.9Ba0.1MnO3 is a ferromagnetic insulator in its bulk form, but exhibits metallicity in thin film form. It has a wide potential in a range of spintronic-related applications, and hence it is critical to understand thickness-dependent electronic structure in thin films as well as substrate/film interface effects. Here, using electrical and in-situ photoemission spectroscopy measurements, we report the electronic structure and interface band profile of high-quality layer-by-layer-grown La0.9Ba0.1MnO3 on single crystal Nb:SrTiO3 substrates. A transition from insulating-to-conducting was observed with increasing La0.9Ba0.1MnO3 thickness, which was explained by the determined interface band diagram of La0.9Ba0.1MnO3/Nb: SrTiO3, where a type II heterojunction was formed.

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