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Reversible metal-insulator transition of Ar-irradiated LaAlO₃/SrTiO₃ interfaces

Aurino, P. P. ; Kalabukhov, A. ; Tuzla, N. ; Olsson, E. ; Klein, Andreas ; Erhart, P. ; Boikov, Y. A. ; Serenkov, I. T. ; Sakharov, V. I. ; Claeson, T. ; Winkler, D. (2022):
Reversible metal-insulator transition of Ar-irradiated LaAlO₃/SrTiO₃ interfaces. (Publisher's Version)
In: Physical Review B, 92 (15), American Physical Society, ISSN 2469-9950, e-ISSN 2469-9969,
DOI: 10.26083/tuprints-00021178,
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Item Type: Article
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Status: Publisher's Version
Title: Reversible metal-insulator transition of Ar-irradiated LaAlO₃/SrTiO₃ interfaces
Language: English
Abstract:

The conducting state of a quasi-two-dimensional electron gas (q2DEG), formed at the heterointerface between the two wide-bandgap insulators LaAlO₃ (LAO) and SrTiO₃, can be made completely insulating by low-energy, 150-eV, Ar⁺ irradiation. The metallic behavior of the interface can be recovered by high-temperature oxygen annealing. The electrical transport properties of the recovered q2DEG are exactly the same as before the irradiation. Microstructural investigations confirm that the transition is not due to physical etching or crystal lattice distortion of the LAO film below its critical thickness. They also reveal a correlation between electrical state, LAO film surface amorphization, and argon ion implantation. The experimental results are in agreement with density functional theory calculations of Ar implantation and migration in the LAO film. This suggests that the metal-insulator transition may be caused by charge trapping in the defect amorphous layer created during the ion irradiation.

Journal or Publication Title: Physical Review B
Volume of the journal: 92
Issue Number: 15
Publisher: American Physical Society
Collation: 9 Seiten
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Surface Science
Date Deposited: 22 Apr 2022 11:04
Last Modified: 22 Apr 2022 11:04
DOI: 10.26083/tuprints-00021178
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-211784
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/21178
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