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Improved cationic s...
Improved cationic stoichiometry and insulating behavior at the interface of LaAlO3/SrTiO3 formed at high oxygen pressure during pulsed-laser deposition
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- Kalaboukhov, Alexei, 1975 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Boikov, Y. A. (författare)
- Russian Academy of Sciences
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- Serenkov, I.T. (författare)
- Russian Academy of Sciences
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- Sakharov, V.I. (författare)
- Russian Academy of Sciences
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- Börjesson, Johan, 1979 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Ljustina, Nikolina, 1980 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Olsson, Eva, 1960 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Winkler, Dag, 1957 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Claeson, Tord, 1938 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2011-02-10
- 2011
- Engelska.
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Ingår i: Europhysics Letters. - : IOP Publishing. - 0295-5075 .- 1286-4854. ; 93:3
- Relaterad länk:
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http://dx.doi.org/10...
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https://doi.org/10.1...
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https://research.cha...
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Abstract
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- Medium-energy ion spectroscopy, MEIS, and scanning transmission electron microscopy, STEM, were used to correlate the atomic structure of LaAlO3/SrTiO3 interfaces with their electrical properties. Interfaces were prepared at high (5x10(-2) mbar) and low (10(-4) mbar) oxygen pressure by pulsed-laser deposition. The high-oxygen-pressure heterostructures were insulating for all thicknesses while the low-oxygen-pressure ones became metallic for thicknesses above 4 unit cells. MEIS data show enhancement of the Sr surface peak and suppression of the La one in interfaces prepared at low oxygen pressure, which is interpreted as a La-Sr intermixing. The effect was considerably smaller in high-oxygen-pressure samples. Analysis of high-angle annular-dark-field STEM images of the LAO films also indicates intermixing between La and Sr in low-oxygen-pressure samples, supporting MEIS data. Our results reveal the important role of oxygen pressure on the formation of the interface electron gas. Copyright (C) EPLA, 2011
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
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Kalaboukhov, Ale ...
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Boikov, Y. A.
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Serenkov, I.T.
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Sakharov, V.I.
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Börjesson, Johan ...
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Ljustina, Nikoli ...
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visa fler...
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Olsson, Eva, 196 ...
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Winkler, Dag, 19 ...
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Claeson, Tord, 1 ...
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