p-type transparent superconductivity in a layered oxide.
basic_science · Level V
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- Record sourced from PubMed, PMID 32832647.
- Also identified by DOI 10.1126/sciadv.abb8570 and PMC identifier 7439643.
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Abstract
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 Li<sub>1-<i>x</i></sub> NbO<sub>2</sub>. The LiNbO<sub>2</sub> epitaxial films with NbO<sub>2</sub> sheets parallel to (111) plane of cubic MgAl<sub>2</sub>O<sub>4</sub> substrates were stabilized by heating amorphous films. The hole doping associated with Li<sup>+</sup> ion deintercalation triggered superconductivity below 4.2 kelvin. Optical measurements revealed that the averaged transmittance to the visible light of ~100-nanometer-thick Li<sub>1-<i>x</i></sub> NbO<sub>2</sub> was ~77%, despite the large number of hole carriers exceeding 10<sup>22</sup> per cubic centimeter. These results indicate that Li<sub>1-<i>x</i></sub> NbO<sub>2</sub> is a previously unknown p-type transparent superconductor, in which strongly correlated electrons at the largely isolated Nb 4d <sub><i>z</i>2</sub> band play an important role for the high transparency.