A possible superconductor-like state at elevated temperatures near metal electrodes in an LaAlO3/SrTiO3 interface

Taeyueb Kim; Shin Ik Kim; Sungjung Joo; Sangsu Kim; Jeehoon Jeon; Jinki Hong; Yong Joo Doh; Seung Hyub Baek; Hyun Cheol Koo

doi:10.1038/s41598-018-29945-y

A possible superconductor-like state at elevated temperatures near metal electrodes in an LaAlO₃/SrTiO₃ interface

Taeyueb Kim, Shin Ik Kim, Sungjung Joo, Sangsu Kim, Jeehoon Jeon, Jinki Hong, Yong Joo Doh, Seung Hyub Baek, Hyun Cheol Koo

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

We experimentally investigated the transport properties near metal electrodes installed on a conducting channel in a LaAlO₃/SrTiO₃ interface. The local region around the Ti and Al electrodes has a higher electrical conductance than that of other regions, where the upper limits of the temperature and magnetic field can be well defined. Beyond these limits, the conductance abruptly decreases, as in the case of a superconductor. The samples with the Ti- or Al-electrode have an upper-limit temperature of approximately 4 K, which is 10 times higher than the conventional superconducting critical temperature of LaAlO₃/SrTiO₃ interfaces and delta-doped SrTiO₃. This phenomenon is explained by the mechanism of electron transfer between the metal electrodes and electronic d-orbitals in the LaAlO₃/SrTiO₃ interface. The transferred electrons trigger a phase transition to a superconductor-like state. Our results contribute to the deep understanding of the superconductivity in the LaAlO₃/SrTiO₃ interface and will be helpful for the development of high-temperature interface superconductors.

Original language	English
Article number	11558
Journal	Scientific reports
Volume	8
Issue number	1
DOIs	https://doi.org/10.1038/s41598-018-29945-y
Publication status	Published - 2018 Dec 1

Bibliographical note

Funding Information:
This work was supported by Basic Science Research Programs (NRF-2017R1D1A1A02018517) through the National Research Foundation of Korea and the Physical Metrology for National Strategic Needs program (KRISS – 2018 – GP2018-0005) of the Korea Research Institute of Standards and Science. It was also supported by KIST and KU-KIST Institutional Programs and a National Research Council of Science & Technology (NST) grant (No. CAP-16-01-KIST).

Publisher Copyright:
© 2018, The Author(s).

ASJC Scopus subject areas

General

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10.1038/s41598-018-29945-y

Cite this

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title = "A possible superconductor-like state at elevated temperatures near metal electrodes in an LaAlO3/SrTiO3 interface",

abstract = "We experimentally investigated the transport properties near metal electrodes installed on a conducting channel in a LaAlO3/SrTiO3 interface. The local region around the Ti and Al electrodes has a higher electrical conductance than that of other regions, where the upper limits of the temperature and magnetic field can be well defined. Beyond these limits, the conductance abruptly decreases, as in the case of a superconductor. The samples with the Ti- or Al-electrode have an upper-limit temperature of approximately 4 K, which is 10 times higher than the conventional superconducting critical temperature of LaAlO3/SrTiO3 interfaces and delta-doped SrTiO3. This phenomenon is explained by the mechanism of electron transfer between the metal electrodes and electronic d-orbitals in the LaAlO3/SrTiO3 interface. The transferred electrons trigger a phase transition to a superconductor-like state. Our results contribute to the deep understanding of the superconductivity in the LaAlO3/SrTiO3 interface and will be helpful for the development of high-temperature interface superconductors.",

author = "Taeyueb Kim and Kim, {Shin Ik} and Sungjung Joo and Sangsu Kim and Jeehoon Jeon and Jinki Hong and Doh, {Yong Joo} and Baek, {Seung Hyub} and Koo, {Hyun Cheol}",

note = "Funding Information: This work was supported by Basic Science Research Programs (NRF-2017R1D1A1A02018517) through the National Research Foundation of Korea and the Physical Metrology for National Strategic Needs program (KRISS – 2018 – GP2018-0005) of the Korea Research Institute of Standards and Science. It was also supported by KIST and KU-KIST Institutional Programs and a National Research Council of Science & Technology (NST) grant (No. CAP-16-01-KIST). Publisher Copyright: {\textcopyright} 2018, The Author(s).",

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AU - Kim, Taeyueb

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AU - Jeon, Jeehoon

AU - Hong, Jinki

AU - Doh, Yong Joo

AU - Baek, Seung Hyub

AU - Koo, Hyun Cheol

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PY - 2018/12/1

Y1 - 2018/12/1

N2 - We experimentally investigated the transport properties near metal electrodes installed on a conducting channel in a LaAlO3/SrTiO3 interface. The local region around the Ti and Al electrodes has a higher electrical conductance than that of other regions, where the upper limits of the temperature and magnetic field can be well defined. Beyond these limits, the conductance abruptly decreases, as in the case of a superconductor. The samples with the Ti- or Al-electrode have an upper-limit temperature of approximately 4 K, which is 10 times higher than the conventional superconducting critical temperature of LaAlO3/SrTiO3 interfaces and delta-doped SrTiO3. This phenomenon is explained by the mechanism of electron transfer between the metal electrodes and electronic d-orbitals in the LaAlO3/SrTiO3 interface. The transferred electrons trigger a phase transition to a superconductor-like state. Our results contribute to the deep understanding of the superconductivity in the LaAlO3/SrTiO3 interface and will be helpful for the development of high-temperature interface superconductors.

AB - We experimentally investigated the transport properties near metal electrodes installed on a conducting channel in a LaAlO3/SrTiO3 interface. The local region around the Ti and Al electrodes has a higher electrical conductance than that of other regions, where the upper limits of the temperature and magnetic field can be well defined. Beyond these limits, the conductance abruptly decreases, as in the case of a superconductor. The samples with the Ti- or Al-electrode have an upper-limit temperature of approximately 4 K, which is 10 times higher than the conventional superconducting critical temperature of LaAlO3/SrTiO3 interfaces and delta-doped SrTiO3. This phenomenon is explained by the mechanism of electron transfer between the metal electrodes and electronic d-orbitals in the LaAlO3/SrTiO3 interface. The transferred electrons trigger a phase transition to a superconductor-like state. Our results contribute to the deep understanding of the superconductivity in the LaAlO3/SrTiO3 interface and will be helpful for the development of high-temperature interface superconductors.

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