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Non-BCS-type superconductivity and critical thickness of SrTiO3/LaAlO3/ SrTiO3 trilayer interface system

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Abstract
As a quest for two-dimensional conducting interface with exotic functionalities for future electronic devices, the perovskite heterointerface of LaAlO3/SrTiO3 (LAO/STO) has been intensively studied. For the LAO/STO heterostructure, the critical thickness of the LAO layer for metallic conduction is 4 unit cells (uc) according to the polar catastrophe scenario. However, we find that metallic conduction can also be induced at the LAO/STO interface with only 1 uc of LAO, as long as it is capped by 3 or more uc of STO. Consistent results are obtained from density functional theory calculations. For this STO/LAO/STO trilayer, we also confirmed a peculiar nonBCS-type superconductivity with a suppressed superconducting gap, which may imply a superconducting coupling distinct from previously reported BCS-type superconductivity in LAO/STO heterointerface. These observations suggest that the STO/LAO/STO trilayer can be another testing board to explore carrier conduction in two-dimensional electron systems for electronic device applications utilizing exotic functionalities.
Author(s)
Yongsu KwakWooju HanThach D.N. NgoDorj OdkhuuYoung Heon Kim임성현최만수도용주이준성송종현김진희
Issued Date
2021
Type
Article
Keyword
Two-dimensional electron gassuperconductivitymetallicity
DOI
10.1016/j.apsusc.2021.150495
URI
https://oak.ulsan.ac.kr/handle/2021.oak/9516
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_crossref_primary_10_1016_j_apsusc_2021_150495&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Non-BCS-type%20superconductivity%20and%20critical%20thickness%20of%20SrTiO3%2FLaAlO3%2F%20SrTiO3%20trilayer%20interface%20system&offset=0&pcAvailability=true
Publisher
APPLIED SURFACE SCIENCE
Location
네덜란드
Language
영어
ISSN
0169-4332
Citation Volume
565
Citation Number
1
Citation Start Page
150495
Citation End Page
150495
Appears in Collections:
Natural Science > Physics
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