Impedance-based interpretations in 2-dimensional electrongas conduction formed in the LaAlO3/SrxCa1-xTiO3/SrTiO3 system

Title
Impedance-based interpretations in 2-dimensional electrongas conduction formed in the LaAlO3/SrxCa1-xTiO3/SrTiO3 system
Authors
박찬록문선영박다희김신익김성근강종윤백승협최정혜김진상최은수황진하
Issue Date
2016-02
Publisher
Journal of Physics and Chemistry of Solids
Citation
VOL 93, 131-136
Abstract
Frequency-dependent impedance spectroscopy was applied to the 2-dimensioanl conduction transport in the LaAlO3/SrxCa1−xTiO3/SrTiO3 system. The 2-dimensional conduction modifies the electrical/dielectric responses of the LaAlO3/SrxCa1−xTiO3/SrTiO3 depending on the magnitude of the interfacial 2-dimensional resistance. The high conduction of the 2-dimensional electron gas (2DEG) layer can be described using a metallic resistor in series with two parallel RC circuits. However, the high resistance of the 2-dimensional layer drives the composite system from a finite low resistor in parallel with the surrounding dielectrics composed of LaAlO3 and SrTiO3 materials to a dielectric capacitor. This change in the resistance of the 2-dimensional layers modifies the overall impedance enabled by the presence of the interfacial layer due to SrxCa1−xTiO3, which alters the charge transport of the 2-dimensional layer from metallic to semiconducting conduction. A noticeable change is observed in the capacitance Bode plots, indicating highly amplified dielectric constants compared with the pristine SrTiO3 substrates and SrxCa1−xTiO3 with a greater Ca content.
URI
http://pubs.kist.re.kr/handle/201004/58680
ISSN
00223697
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KIST Publication > Article
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