p-type transparent superconductivity in a layered oxide

Takuto Soma, Kohei Yoshimatsu, Akira Ohtomo

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Development of p-type transparent conducting materials has been a challenging issue. The known p-type transparent conductors unsatisfy both of high transparency and high conductivity nor exhibit superconductivity. Here, we report on epitaxial synthesis, excellent p-type transparent conductivity, and two-dimensional superconductivity of Li1−xNbO2. The LiNbO2 epitaxial films with NbO2 sheets parallel to (111) plane of cubic MgAl2O4 substrates were stabilized by heating amorphous films. The hole doping associated with Li+ ion deintercalation triggered superconductivity below 4.2 kelvin. Optical measurements revealed that the averaged transmittance to the visible light of ~100-nanometer-thick Li1−xNbO2 was ~77%, despite the large number of hole carriers exceeding 1022 per cubic centimeter. These results indicate that Li1−xNbO2 is a previously unknown p-type transparent superconductor, in which strongly correlated electrons at the largely isolated Nb 4dz2 band play an important role for the high transparency.

Original languageEnglish
Article numbereabb8570
JournalScience advances
Issue number29
Publication statusPublished - 2020 Jul


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