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

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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 languageEnglish
Article number11558
JournalScientific reports
Volume8
Issue number1
DOIs
Publication statusPublished - 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

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