High temperature conductance characteristics of LaAlO3/SrTiO3-heterostructures under equilibrium oxygen atmospheres
High temperature conductance characteristics of LaAlO3/SrTiO3-heterostructures under equilibrium oxygen atmospheres
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DOI：
10.1063/1.3457386
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发表时间：
2010-07-05
影响因子：
4
通讯作者：
Waser, R.
中科院分区：
文献类型：
--
作者：
Gunkel, F.;Hoffmann-Eifert, S.;Waser, R.
研究了高温氧平衡下LaAlO3/SrTiO3异质结构的界面电导。将异质结构的电导对氧分压（从 10(-22) 到 1 bar）和温度（800 到 1100 K）的依赖性与 SrTiO3 单晶的特性进行了比较，这是用缺陷化学模型描述的。高达 950 K 的平衡异质结构揭示了类金属传导路径的额外影响，并且对氧分压的依赖性非常轻微。讨论了加工过程中晶格畸变或 A 位阳离子混合可能产生的供体型界面态，作为 LaAlO3/SrTiO3 异质结构异常界面传导的可能来源。 (C) 2010 年美国物理研究所。 [号码：10.1063/1.3457386]
The interface conductance of LaAlO3/SrTiO3 heterostructures was investigated under high temperature oxygen equilibrium. The dependence of the heterostructure's conductance on oxygen partial pressure (from 10(-22) to 1 bar) and temperature (800 to 1100 K) was compared to the characteristic of SrTiO3 single crystals, which is described in terms of a defect chemistry model. Up to 950 K the equilibrated heterostructures reveal an additional influence of a metallic-like conduction path with a very slight dependence on the oxygen partial pressure. Donor-type interface states which may result from either lattice distortions or A-site cation intermixing during processing are discussed as a possible origin for the exceptional interface conduction of LaAlO3/SrTiO3 heterostructures. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3457386]