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

Kwak, Yongsu; Han, Woojoo; Ngo, Thach D.N.; Odkhuu, Dorj; Kim, Young Heon; Rhim, Sonny H.; Choi, Mahn-Soo; Doh, Yong-Joo; Lee, Joon Sung; Song, Jonghyun; Kim, Jinhee

doi:10.1016/j.apsusc.2021.150495

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

Applied surface science, v.565, 2021년, pp.150495 -

Kwak, Yongsu (Korea Research Institute of Standards and Science) , Han, Woojoo (Korea Research Institute of Standards and Science) , Ngo, Thach D.N. (Korea Research Institute of Standards and Science) , Odkhuu, Dorj (Department of Physics, Incheon National University) , Kim, Young Heon (Graduate School of Analytical Science and Technology) , Rhim, Sonny H. (Department of Physics and Energy Harvest Storage Research Center (EHSRC), University of Ulsan) , Choi, Mahn-Soo (Department of Physics, Korea University) , Doh, Yong-Joo (Department of Physics and Photon Science, Gwangju Institute of Science and Technology) , Lee, Joon Sung (Display and Semiconductor Physics, Korea University Sejong Campus) , Song, Jonghyun (Department of Physics, Chungnam National University) , Kim, Jinhee (Korea Research Institute)

Abstract ▼ AI-Helper

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 non-BCS-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. Highlights When thin LaAlO3 (1-unit-cell)/SrTiO3 is capped by SrTiO3, conduction is induced. The critical thickness condition for conduction is consistent with DFT calculation. SrTiO3/LaAlO3/SrTiO3 shows non-BCS-type superconductivity. Graphical abstract [DISPLAY OMISSION]

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DOI : 10.1016/j.apsusc.2021.150495
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