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Suppression of conductivity by 1 uc buffer layer at LAO/STO interface.

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Title: Suppression of conductivity by 1 uc buffer layer at LAO/STO interface.
Authors: Nehra, Simran1,2 (AUTHOR), Kumar, Sumit1,2 (AUTHOR), Shrivastava, Shikha1,2 (AUTHOR), Chhillar, Sonu3 (AUTHOR), Yadav, C.S.3 (AUTHOR), Dogra, Anjana1,2 (AUTHOR) anjanad@nplindia.org
Source: Physica B. Jul2023, Vol. 660, pN.PAG-N.PAG. 1p.
Subjects: Buffer layers, Heterojunctions, Transition metals, Catastrophe modeling, Metal-insulator transitions, Charge transfer
Abstract: The conducting properties of oxide heterointerface can be significantly affected by buffer layers, gate voltage, capping layer, etc.; sometimes, a monolayer is enough to show a drastic change in these properties. Herein, we report that the insertion of one unit-cell (uc) of CaMnO 3 material as a buffer layer at conducting LaAlO 3 /SrTiO 3 interface turns it into an insulator. The presence of MnO 2 -layer in CaMnO 3 uc at the interface blocks the charge transfer to SrTiO 3 which makes the interface conducting as explained by the polar catastrophe model. The study may help to resolve the puzzle of the origin of conductivity at oxide heterostructure interfaces. • CaMnO3 buffer layer at LAO/STO interface. • Conducting LAO/STO interface turns insulating with 1unit cell buffer layer of CaMnO3. • Metal to insulator transition with buffer layer has been explained on basis of multivalent Mn. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:The conducting properties of oxide heterointerface can be significantly affected by buffer layers, gate voltage, capping layer, etc.; sometimes, a monolayer is enough to show a drastic change in these properties. Herein, we report that the insertion of one unit-cell (uc) of CaMnO 3 material as a buffer layer at conducting LaAlO 3 /SrTiO 3 interface turns it into an insulator. The presence of MnO 2 -layer in CaMnO 3 uc at the interface blocks the charge transfer to SrTiO 3 which makes the interface conducting as explained by the polar catastrophe model. The study may help to resolve the puzzle of the origin of conductivity at oxide heterostructure interfaces. • CaMnO3 buffer layer at LAO/STO interface. • Conducting LAO/STO interface turns insulating with 1unit cell buffer layer of CaMnO3. • Metal to insulator transition with buffer layer has been explained on basis of multivalent Mn. [ABSTRACT FROM AUTHOR]
ISSN:09214526
DOI:10.1016/j.physb.2023.414871