Insulating-to-conducting behavior and band profile across the La0.9Ba0.1MnO3/Nb:SrTiO3 epitaxial interface
Physical Review B
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Li, W., Kleibeuker, J., Wu, R., Zhang, K., Yun, C., & MacManus-Driscoll, J. (2017). Insulating-to-conducting behavior and band profile across the La0.9Ba0.1MnO3/Nb:SrTiO3 epitaxial interface. Physical Review B, 96 (16)https://doi.org/10.1103/PhysRevB.96.165103
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.
This work was supported by EPSRC grant EP/K035282/1, EPSRC grant EP/N004272/1, and the Isaac Newton Trust (Minute 13.38(k)).
External DOI: https://doi.org/10.1103/PhysRevB.96.165103
This record's URL: https://www.repository.cam.ac.uk/handle/1810/275634