A persistent metal-insulator transition at the surface of an oxygen-deficient, epitaxial manganite film

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	A persistent metal-insulator transition at the surface of an oxygen-deficient, epitaxial manganite film
	Snijders, PC ; Gao, M ; Guo, HW ; Cao, GX ; Siemons, W ; Gao, HJ ; Ward, TZ ; Shen, J ; Gai, Z
刊名	NANOSCALE
	2013
卷号	5 期号:20 页码:9659
ISSN号	2040-3364
通讯作者	Gai, Z (reprint author), Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
中文摘要	The oxygen stoichiometry has a large influence on the physical and chemical properties of complex oxides. Most of the functionality in e. g. catalysis and electrochemistry depends in particular on control of the oxygen stoichiometry. In order to understand the fundamental properties of intrinsic surfaces of oxygen-deficient complex oxides, we report on in situ temperature dependent scanning tunnelling spectroscopy experiments on pristine oxygen deficient, epitaxial manganite films. Although these films are insulating in subsequent ex situ in-plane electronic transport experiments at all temperatures, in situ scanning tunnelling spectroscopic data reveal that the surface of these films exhibits a metal-insulator transition (MIT) at 120 K, coincident with the onset of ferromagnetic ordering of small clusters in the bulk of the oxygen-deficient film. The surprising proximity of the surface MIT transition temperature of nonstoichiometric films with that of the fully oxygenated bulk suggests that the electronic properties in the surface region are not significantly affected by oxygen deficiency in the bulk. This carries important implications for the understanding and functional design of complex oxides and their interfaces with specific electronic properties in catalysis, oxide electronics and electrochemistry.
资助信息	U.S. DOE, BES; National Basic Research Program of China (973 Program) [2011CB921801]
语种	英语
公开日期	2014-01-16
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/56734]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Snijders, PC,Gao, M,Guo, HW,et al. A persistent metal-insulator transition at the surface of an oxygen-deficient, epitaxial manganite film[J]. NANOSCALE,2013,5(20):9659.
APA	Snijders, PC.,Gao, M.,Guo, HW.,Cao, GX.,Siemons, W.,...&Gai, Z.(2013).A persistent metal-insulator transition at the surface of an oxygen-deficient, epitaxial manganite film.NANOSCALE,5(20),9659.
MLA	Snijders, PC,et al."A persistent metal-insulator transition at the surface of an oxygen-deficient, epitaxial manganite film".NANOSCALE 5.20(2013):9659.